What makes the difference on partially and fully visible moon?
While I'm satisfied (despite the fringe) with shoots from a partially visible moon with a cheap 500 mm lens:
1/100 ISO 100 f/?
I cannot understand why the image quality is extremely diminished when doing the same with an almost fully visible moon:
1/80 ISO 100 f/?
I suppose that fully visible is much brighter and when I try to compensate the situation by changing the aperture these effect show up.
Is there an obvious explanation or do I just mess up the focus every time?
EDIT:
I repeated the process with an APS-C instead of full-format camera, now one of the images looks better (showing more details):
1/250 ISO 100 (APS-C)
I'm not sure whether the crop factor allows me to focus more accurate or this is due to the 50% magnification. At least it shows more details.
aperture astrophotography manual-focus sharpness moon
edited Nov 23 '18 at 21:17
MichaelK
1625
asked Nov 22 '18 at 20:03
stackerstacker
2428
add a comment |
While I'm satisfied (despite the fringe) with shoots from a partially visible moon with a cheap 500 mm lens:
1/100 ISO 100 f/?
I cannot understand why the image quality is extremely diminished when doing the same with an almost fully visible moon:
1/80 ISO 100 f/?
I suppose that fully visible is much brighter and when I try to compensate the situation by changing the aperture these effect show up.
Is there an obvious explanation or do I just mess up the focus every time?
EDIT:
I repeated the process with an APS-C instead of full-format camera, now one of the images looks better (showing more details):
1/250 ISO 100 (APS-C)
I'm not sure whether the crop factor allows me to focus more accurate or this is due to the 50% magnification. At least it shows more details.
aperture astrophotography manual-focus sharpness moon
edited Nov 23 '18 at 21:17
MichaelK
1625
asked Nov 22 '18 at 20:03
stackerstacker
2428
1
Does photo.stackexchange.com/a/83792/47295 answer your question?
– Peter Taylor
Nov 22 '18 at 20:14
@PeterTaylor not completly I already tried bracketing, and 5 ago minutes repeated the process changing from full-format to aps-c which looks bit better. I will add one of these images later to refine the question, thank you for pointing me to this post.
– stacker
Nov 22 '18 at 20:45
Upper photos look slightly out of focus. Or is this the difference between 1/80 and 1/250 shutter speed? Unlikely.
– IMil
Nov 23 '18 at 1:39
IMO the second image is sharper than the first, even if it has poorer contrast.
– Darren Ringer
Nov 23 '18 at 14:24
2
Next time you are out experimenting, take at least ten exposures for every different setting and variable you are comparing. You'll see that with the moon, and many other astronomical subjects, there can be significant shot-to-shot differences from one frame to the next using the same exact settings. This is due to the effect of the Earth's atmosphere.
– Michael C
Nov 24 '18 at 11:51
add a comment |
While I'm satisfied (despite the fringe) with shoots from a partially visible moon with a cheap 500 mm lens:
1/100 ISO 100 f/?
I cannot understand why the image quality is extremely diminished when doing the same with an almost fully visible moon:
1/80 ISO 100 f/?
I suppose that fully visible is much brighter and when I try to compensate the situation by changing the aperture these effect show up.
Is there an obvious explanation or do I just mess up the focus every time?
EDIT:
I repeated the process with an APS-C instead of full-format camera, now one of the images looks better (showing more details):
1/250 ISO 100 (APS-C)
I'm not sure whether the crop factor allows me to focus more accurate or this is due to the 50% magnification. At least it shows more details.
aperture astrophotography manual-focus sharpness moon
edited Nov 23 '18 at 21:17
MichaelK
1625
asked Nov 22 '18 at 20:03
stackerstacker
2428
While I'm satisfied (despite the fringe) with shoots from a partially visible moon with a cheap 500 mm lens:
1/100 ISO 100 f/?
I cannot understand why the image quality is extremely diminished when doing the same with an almost fully visible moon:
1/80 ISO 100 f/?
I suppose that fully visible is much brighter and when I try to compensate the situation by changing the aperture these effect show up.
Is there an obvious explanation or do I just mess up the focus every time?
EDIT:
I repeated the process with an APS-C instead of full-format camera, now one of the images looks better (showing more details):
1/250 ISO 100 (APS-C)
I'm not sure whether the crop factor allows me to focus more accurate or this is due to the 50% magnification. At least it shows more details.
aperture astrophotography manual-focus sharpness moon
aperture astrophotography manual-focus sharpness moon
edited Nov 23 '18 at 21:17
MichaelK
1625
asked Nov 22 '18 at 20:03
stackerstacker
2428
edited Nov 23 '18 at 21:17
MichaelK
1625
asked Nov 22 '18 at 20:03
stackerstacker
2428
edited Nov 23 '18 at 21:17
MichaelK
1625
edited Nov 23 '18 at 21:17
MichaelK
1625
edited Nov 23 '18 at 21:17
MichaelK
1625
1625
asked Nov 22 '18 at 20:03
stackerstacker
2428
asked Nov 22 '18 at 20:03
stackerstacker
2428
asked Nov 22 '18 at 20:03
stackerstacker
2428
2428
1
Does photo.stackexchange.com/a/83792/47295 answer your question?
– Peter Taylor
Nov 22 '18 at 20:14
@PeterTaylor not completly I already tried bracketing, and 5 ago minutes repeated the process changing from full-format to aps-c which looks bit better. I will add one of these images later to refine the question, thank you for pointing me to this post.
– stacker
Nov 22 '18 at 20:45
Upper photos look slightly out of focus. Or is this the difference between 1/80 and 1/250 shutter speed? Unlikely.
– IMil
Nov 23 '18 at 1:39
IMO the second image is sharper than the first, even if it has poorer contrast.
– Darren Ringer
Nov 23 '18 at 14:24
2
Next time you are out experimenting, take at least ten exposures for every different setting and variable you are comparing. You'll see that with the moon, and many other astronomical subjects, there can be significant shot-to-shot differences from one frame to the next using the same exact settings. This is due to the effect of the Earth's atmosphere.
– Michael C
Nov 24 '18 at 11:51
add a comment |
1
Does photo.stackexchange.com/a/83792/47295 answer your question?
– Peter Taylor
Nov 22 '18 at 20:14
@PeterTaylor not completly I already tried bracketing, and 5 ago minutes repeated the process changing from full-format to aps-c which looks bit better. I will add one of these images later to refine the question, thank you for pointing me to this post.
– stacker
Nov 22 '18 at 20:45
Upper photos look slightly out of focus. Or is this the difference between 1/80 and 1/250 shutter speed? Unlikely.
– IMil
Nov 23 '18 at 1:39
IMO the second image is sharper than the first, even if it has poorer contrast.
– Darren Ringer
Nov 23 '18 at 14:24
2
Next time you are out experimenting, take at least ten exposures for every different setting and variable you are comparing. You'll see that with the moon, and many other astronomical subjects, there can be significant shot-to-shot differences from one frame to the next using the same exact settings. This is due to the effect of the Earth's atmosphere.
– Michael C
Nov 24 '18 at 11:51
1
1
Does photo.stackexchange.com/a/83792/47295 answer your question?
– Peter Taylor
Nov 22 '18 at 20:14
Does photo.stackexchange.com/a/83792/47295 answer your question?
– Peter Taylor
Nov 22 '18 at 20:14
@PeterTaylor not completly I already tried bracketing, and 5 ago minutes repeated the process changing from full-format to aps-c which looks bit better. I will add one of these images later to refine the question, thank you for pointing me to this post.
– stacker
Nov 22 '18 at 20:45
@PeterTaylor not completly I already tried bracketing, and 5 ago minutes repeated the process changing from full-format to aps-c which looks bit better. I will add one of these images later to refine the question, thank you for pointing me to this post.
– stacker
Nov 22 '18 at 20:45
Upper photos look slightly out of focus. Or is this the difference between 1/80 and 1/250 shutter speed? Unlikely.
– IMil
Nov 23 '18 at 1:39
Upper photos look slightly out of focus. Or is this the difference between 1/80 and 1/250 shutter speed? Unlikely.
– IMil
Nov 23 '18 at 1:39
IMO the second image is sharper than the first, even if it has poorer contrast.
– Darren Ringer
Nov 23 '18 at 14:24
IMO the second image is sharper than the first, even if it has poorer contrast.
– Darren Ringer
Nov 23 '18 at 14:24
2
2
Next time you are out experimenting, take at least ten exposures for every different setting and variable you are comparing. You'll see that with the moon, and many other astronomical subjects, there can be significant shot-to-shot differences from one frame to the next using the same exact settings. This is due to the effect of the Earth's atmosphere.
– Michael C
Nov 24 '18 at 11:51
Next time you are out experimenting, take at least ten exposures for every different setting and variable you are comparing. You'll see that with the moon, and many other astronomical subjects, there can be significant shot-to-shot differences from one frame to the next using the same exact settings. This is due to the effect of the Earth's atmosphere.
– Michael C
Nov 24 '18 at 11:51
add a comment |
2 Answers
2
active
oldest
votes
What makes the difference on partially and fully visible moon?
In a word: shadows.
I cannot understand why the IQ is extremely diminished when doing the same with an almost fully visible moon.
The second image does appear to suffer from lower sharpness and overall quality. However, even if the technical image quality factors were equal, most importantly, a full moon will appear flat and uninteresting, as compared to a gibbous (i.e., 3/4-ish) moon.
We see a full moon that is lit directly "overhead". The mountain and crater rims do not cast any shadows that give texture and depth to the moon's surface. Thus, we only get tonal information from the albedo (reflectivity) of the local regolith in parts of the image.
However, with a partial moon, the surface is more side-lit, thus casting shadows. These shadows provide vital depth clues to our eyes, and greater tonal variations. Even if the technical image quality is the same (i.e., same accurate focusing, correct exposure, no motion blur, etc.), a partial moon's greater tonal and texture variations will make for a more apparently higher-quality moon image.
Your images provide for excellent comparison. Looking at Tycho Crater (the large impact crater in the south-southeast view, with large whitish ejecta streaks emanating from it): Notice in the gibbous phase image, Tycho crater has a distinct rim and bowl, and is surrounded by lots of smaller impact craters. Whereas, in the full moon image, the shape of Tycho crater is apparent, but it has no depth, no sense of being an obvious bowl. The smaller impact craters immediately surrounding it are nearly invisible, and the general area surrounding Tycho is just a smudge of middle gray.
The third image has substantially higher quality than the second image. However, even with its increased clarity and dynamic range, notice that the area immediately surrounding Tycho crater still doesn't exhibit much depth. The crater rim has more definition than the second image, but to my eye, doesn't exhibit nearly the same dimensionality and character as the first image does.
answered Nov 22 '18 at 20:48
scottbbscottbb
20.4k75893
Thank you for this detailed answer +1, could you include the 3rd image (aps-c which is more pronounced ) in your answer.
– stacker
Nov 22 '18 at 21:16
3
@stacker Looks like a combo of factors. The second image is not focused as well as the third and the third image also appears to have been captured with a different tone curve and has more contrast. The latter is a function of the camera's rendering settings.
– doug
Nov 22 '18 at 21:52
add a comment |
The full moon is illuminated by the sun which is directly overhead, i.e. noon. Mountains on the moon's surface, at noon local time, cast no shadows. When the moon appears to be partially illuminated, gibbous, 1st.or last quarter, 1/2 moon, crescent etc. This local time is such that the sun casts shadows. A view of the moon from earth is enhanced by shadows as they heighten the illusion of depth.
answered Nov 22 '18 at 21:57
Alan MarcusAlan Marcus
25.6k23060
[Solar] noon is when the sun is at its highest point of the day, not necessarily directly overhead. Indeed it's very rarely directly overhead any given point.
– Lightness Races in Orbit
Nov 23 '18 at 18:05
@LightnessRacesinOrbit Indeed. As a matter of fact, the sun can only possibly be directly overhead in latitudes between the tropics of Cancer and Capricorn. This is called Lāhainā noon. For the two tropics, Lāhainā noon occurs exactly once per year. For latitudes strictly between the two tropics, it occurs twice per year.
– scottbb
Nov 23 '18 at 21:06
@scottbb That's right.
– Lightness Races in Orbit
Nov 23 '18 at 21:26
1
For all intent and purpose - A full moon is seen with reduced contrast because mountains on the moon cast little or no shadow when the moon is seen from the earth as a full moon.
– Alan Marcus
Nov 24 '18 at 1:01
add a comment |
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2 Answers
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active
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2 Answers
2
active
oldest
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oldest
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active
oldest
votes
What makes the difference on partially and fully visible moon?
In a word: shadows.
I cannot understand why the IQ is extremely diminished when doing the same with an almost fully visible moon.
The second image does appear to suffer from lower sharpness and overall quality. However, even if the technical image quality factors were equal, most importantly, a full moon will appear flat and uninteresting, as compared to a gibbous (i.e., 3/4-ish) moon.
We see a full moon that is lit directly "overhead". The mountain and crater rims do not cast any shadows that give texture and depth to the moon's surface. Thus, we only get tonal information from the albedo (reflectivity) of the local regolith in parts of the image.
However, with a partial moon, the surface is more side-lit, thus casting shadows. These shadows provide vital depth clues to our eyes, and greater tonal variations. Even if the technical image quality is the same (i.e., same accurate focusing, correct exposure, no motion blur, etc.), a partial moon's greater tonal and texture variations will make for a more apparently higher-quality moon image.
Your images provide for excellent comparison. Looking at Tycho Crater (the large impact crater in the south-southeast view, with large whitish ejecta streaks emanating from it): Notice in the gibbous phase image, Tycho crater has a distinct rim and bowl, and is surrounded by lots of smaller impact craters. Whereas, in the full moon image, the shape of Tycho crater is apparent, but it has no depth, no sense of being an obvious bowl. The smaller impact craters immediately surrounding it are nearly invisible, and the general area surrounding Tycho is just a smudge of middle gray.
The third image has substantially higher quality than the second image. However, even with its increased clarity and dynamic range, notice that the area immediately surrounding Tycho crater still doesn't exhibit much depth. The crater rim has more definition than the second image, but to my eye, doesn't exhibit nearly the same dimensionality and character as the first image does.
answered Nov 22 '18 at 20:48
scottbbscottbb
20.4k75893
Thank you for this detailed answer +1, could you include the 3rd image (aps-c which is more pronounced ) in your answer.
– stacker
Nov 22 '18 at 21:16
3
@stacker Looks like a combo of factors. The second image is not focused as well as the third and the third image also appears to have been captured with a different tone curve and has more contrast. The latter is a function of the camera's rendering settings.
– doug
Nov 22 '18 at 21:52
add a comment |
What makes the difference on partially and fully visible moon?
In a word: shadows.
I cannot understand why the IQ is extremely diminished when doing the same with an almost fully visible moon.
The second image does appear to suffer from lower sharpness and overall quality. However, even if the technical image quality factors were equal, most importantly, a full moon will appear flat and uninteresting, as compared to a gibbous (i.e., 3/4-ish) moon.
We see a full moon that is lit directly "overhead". The mountain and crater rims do not cast any shadows that give texture and depth to the moon's surface. Thus, we only get tonal information from the albedo (reflectivity) of the local regolith in parts of the image.
However, with a partial moon, the surface is more side-lit, thus casting shadows. These shadows provide vital depth clues to our eyes, and greater tonal variations. Even if the technical image quality is the same (i.e., same accurate focusing, correct exposure, no motion blur, etc.), a partial moon's greater tonal and texture variations will make for a more apparently higher-quality moon image.
Your images provide for excellent comparison. Looking at Tycho Crater (the large impact crater in the south-southeast view, with large whitish ejecta streaks emanating from it): Notice in the gibbous phase image, Tycho crater has a distinct rim and bowl, and is surrounded by lots of smaller impact craters. Whereas, in the full moon image, the shape of Tycho crater is apparent, but it has no depth, no sense of being an obvious bowl. The smaller impact craters immediately surrounding it are nearly invisible, and the general area surrounding Tycho is just a smudge of middle gray.
The third image has substantially higher quality than the second image. However, even with its increased clarity and dynamic range, notice that the area immediately surrounding Tycho crater still doesn't exhibit much depth. The crater rim has more definition than the second image, but to my eye, doesn't exhibit nearly the same dimensionality and character as the first image does.
answered Nov 22 '18 at 20:48
scottbbscottbb
20.4k75893
Thank you for this detailed answer +1, could you include the 3rd image (aps-c which is more pronounced ) in your answer.
– stacker
Nov 22 '18 at 21:16
3
@stacker Looks like a combo of factors. The second image is not focused as well as the third and the third image also appears to have been captured with a different tone curve and has more contrast. The latter is a function of the camera's rendering settings.
– doug
Nov 22 '18 at 21:52
add a comment |
What makes the difference on partially and fully visible moon?
In a word: shadows.
I cannot understand why the IQ is extremely diminished when doing the same with an almost fully visible moon.
The second image does appear to suffer from lower sharpness and overall quality. However, even if the technical image quality factors were equal, most importantly, a full moon will appear flat and uninteresting, as compared to a gibbous (i.e., 3/4-ish) moon.
We see a full moon that is lit directly "overhead". The mountain and crater rims do not cast any shadows that give texture and depth to the moon's surface. Thus, we only get tonal information from the albedo (reflectivity) of the local regolith in parts of the image.
However, with a partial moon, the surface is more side-lit, thus casting shadows. These shadows provide vital depth clues to our eyes, and greater tonal variations. Even if the technical image quality is the same (i.e., same accurate focusing, correct exposure, no motion blur, etc.), a partial moon's greater tonal and texture variations will make for a more apparently higher-quality moon image.
Your images provide for excellent comparison. Looking at Tycho Crater (the large impact crater in the south-southeast view, with large whitish ejecta streaks emanating from it): Notice in the gibbous phase image, Tycho crater has a distinct rim and bowl, and is surrounded by lots of smaller impact craters. Whereas, in the full moon image, the shape of Tycho crater is apparent, but it has no depth, no sense of being an obvious bowl. The smaller impact craters immediately surrounding it are nearly invisible, and the general area surrounding Tycho is just a smudge of middle gray.
The third image has substantially higher quality than the second image. However, even with its increased clarity and dynamic range, notice that the area immediately surrounding Tycho crater still doesn't exhibit much depth. The crater rim has more definition than the second image, but to my eye, doesn't exhibit nearly the same dimensionality and character as the first image does.
answered Nov 22 '18 at 20:48
scottbbscottbb
20.4k75893
What makes the difference on partially and fully visible moon?
In a word: shadows.
I cannot understand why the IQ is extremely diminished when doing the same with an almost fully visible moon.
The second image does appear to suffer from lower sharpness and overall quality. However, even if the technical image quality factors were equal, most importantly, a full moon will appear flat and uninteresting, as compared to a gibbous (i.e., 3/4-ish) moon.
We see a full moon that is lit directly "overhead". The mountain and crater rims do not cast any shadows that give texture and depth to the moon's surface. Thus, we only get tonal information from the albedo (reflectivity) of the local regolith in parts of the image.
However, with a partial moon, the surface is more side-lit, thus casting shadows. These shadows provide vital depth clues to our eyes, and greater tonal variations. Even if the technical image quality is the same (i.e., same accurate focusing, correct exposure, no motion blur, etc.), a partial moon's greater tonal and texture variations will make for a more apparently higher-quality moon image.
Your images provide for excellent comparison. Looking at Tycho Crater (the large impact crater in the south-southeast view, with large whitish ejecta streaks emanating from it): Notice in the gibbous phase image, Tycho crater has a distinct rim and bowl, and is surrounded by lots of smaller impact craters. Whereas, in the full moon image, the shape of Tycho crater is apparent, but it has no depth, no sense of being an obvious bowl. The smaller impact craters immediately surrounding it are nearly invisible, and the general area surrounding Tycho is just a smudge of middle gray.
The third image has substantially higher quality than the second image. However, even with its increased clarity and dynamic range, notice that the area immediately surrounding Tycho crater still doesn't exhibit much depth. The crater rim has more definition than the second image, but to my eye, doesn't exhibit nearly the same dimensionality and character as the first image does.
answered Nov 22 '18 at 20:48
scottbbscottbb
20.4k75893
edited Nov 23 '18 at 20:13
answered Nov 22 '18 at 20:48
scottbbscottbb
20.4k75893
answered Nov 22 '18 at 20:48
scottbbscottbb
20.4k75893
answered Nov 22 '18 at 20:48
scottbbscottbb
20.4k75893
20.4k75893
Thank you for this detailed answer +1, could you include the 3rd image (aps-c which is more pronounced ) in your answer.
– stacker
Nov 22 '18 at 21:16
3
@stacker Looks like a combo of factors. The second image is not focused as well as the third and the third image also appears to have been captured with a different tone curve and has more contrast. The latter is a function of the camera's rendering settings.
– doug
Nov 22 '18 at 21:52
add a comment |
Thank you for this detailed answer +1, could you include the 3rd image (aps-c which is more pronounced ) in your answer.
– stacker
Nov 22 '18 at 21:16
3
@stacker Looks like a combo of factors. The second image is not focused as well as the third and the third image also appears to have been captured with a different tone curve and has more contrast. The latter is a function of the camera's rendering settings.
– doug
Nov 22 '18 at 21:52
Thank you for this detailed answer +1, could you include the 3rd image (aps-c which is more pronounced ) in your answer.
– stacker
Nov 22 '18 at 21:16
Thank you for this detailed answer +1, could you include the 3rd image (aps-c which is more pronounced ) in your answer.
– stacker
Nov 22 '18 at 21:16
3
3
@stacker Looks like a combo of factors. The second image is not focused as well as the third and the third image also appears to have been captured with a different tone curve and has more contrast. The latter is a function of the camera's rendering settings.
– doug
Nov 22 '18 at 21:52
@stacker Looks like a combo of factors. The second image is not focused as well as the third and the third image also appears to have been captured with a different tone curve and has more contrast. The latter is a function of the camera's rendering settings.
– doug
Nov 22 '18 at 21:52
add a comment |
The full moon is illuminated by the sun which is directly overhead, i.e. noon. Mountains on the moon's surface, at noon local time, cast no shadows. When the moon appears to be partially illuminated, gibbous, 1st.or last quarter, 1/2 moon, crescent etc. This local time is such that the sun casts shadows. A view of the moon from earth is enhanced by shadows as they heighten the illusion of depth.
answered Nov 22 '18 at 21:57
Alan MarcusAlan Marcus
25.6k23060
[Solar] noon is when the sun is at its highest point of the day, not necessarily directly overhead. Indeed it's very rarely directly overhead any given point.
– Lightness Races in Orbit
Nov 23 '18 at 18:05
@LightnessRacesinOrbit Indeed. As a matter of fact, the sun can only possibly be directly overhead in latitudes between the tropics of Cancer and Capricorn. This is called Lāhainā noon. For the two tropics, Lāhainā noon occurs exactly once per year. For latitudes strictly between the two tropics, it occurs twice per year.
– scottbb
Nov 23 '18 at 21:06
@scottbb That's right.
– Lightness Races in Orbit
Nov 23 '18 at 21:26
1
For all intent and purpose - A full moon is seen with reduced contrast because mountains on the moon cast little or no shadow when the moon is seen from the earth as a full moon.
– Alan Marcus
Nov 24 '18 at 1:01
add a comment |
The full moon is illuminated by the sun which is directly overhead, i.e. noon. Mountains on the moon's surface, at noon local time, cast no shadows. When the moon appears to be partially illuminated, gibbous, 1st.or last quarter, 1/2 moon, crescent etc. This local time is such that the sun casts shadows. A view of the moon from earth is enhanced by shadows as they heighten the illusion of depth.
answered Nov 22 '18 at 21:57
Alan MarcusAlan Marcus
25.6k23060
[Solar] noon is when the sun is at its highest point of the day, not necessarily directly overhead. Indeed it's very rarely directly overhead any given point.
– Lightness Races in Orbit
Nov 23 '18 at 18:05
@LightnessRacesinOrbit Indeed. As a matter of fact, the sun can only possibly be directly overhead in latitudes between the tropics of Cancer and Capricorn. This is called Lāhainā noon. For the two tropics, Lāhainā noon occurs exactly once per year. For latitudes strictly between the two tropics, it occurs twice per year.
– scottbb
Nov 23 '18 at 21:06
@scottbb That's right.
– Lightness Races in Orbit
Nov 23 '18 at 21:26
1
For all intent and purpose - A full moon is seen with reduced contrast because mountains on the moon cast little or no shadow when the moon is seen from the earth as a full moon.
– Alan Marcus
Nov 24 '18 at 1:01
add a comment |
The full moon is illuminated by the sun which is directly overhead, i.e. noon. Mountains on the moon's surface, at noon local time, cast no shadows. When the moon appears to be partially illuminated, gibbous, 1st.or last quarter, 1/2 moon, crescent etc. This local time is such that the sun casts shadows. A view of the moon from earth is enhanced by shadows as they heighten the illusion of depth.
answered Nov 22 '18 at 21:57
Alan MarcusAlan Marcus
25.6k23060
The full moon is illuminated by the sun which is directly overhead, i.e. noon. Mountains on the moon's surface, at noon local time, cast no shadows. When the moon appears to be partially illuminated, gibbous, 1st.or last quarter, 1/2 moon, crescent etc. This local time is such that the sun casts shadows. A view of the moon from earth is enhanced by shadows as they heighten the illusion of depth.
answered Nov 22 '18 at 21:57
Alan MarcusAlan Marcus
25.6k23060
answered Nov 22 '18 at 21:57
Alan MarcusAlan Marcus
25.6k23060
answered Nov 22 '18 at 21:57
Alan MarcusAlan Marcus
25.6k23060
answered Nov 22 '18 at 21:57
Alan MarcusAlan Marcus
25.6k23060
25.6k23060
[Solar] noon is when the sun is at its highest point of the day, not necessarily directly overhead. Indeed it's very rarely directly overhead any given point.
– Lightness Races in Orbit
Nov 23 '18 at 18:05
@LightnessRacesinOrbit Indeed. As a matter of fact, the sun can only possibly be directly overhead in latitudes between the tropics of Cancer and Capricorn. This is called Lāhainā noon. For the two tropics, Lāhainā noon occurs exactly once per year. For latitudes strictly between the two tropics, it occurs twice per year.
– scottbb
Nov 23 '18 at 21:06
@scottbb That's right.
– Lightness Races in Orbit
Nov 23 '18 at 21:26
1
For all intent and purpose - A full moon is seen with reduced contrast because mountains on the moon cast little or no shadow when the moon is seen from the earth as a full moon.
– Alan Marcus
Nov 24 '18 at 1:01
add a comment |
[Solar] noon is when the sun is at its highest point of the day, not necessarily directly overhead. Indeed it's very rarely directly overhead any given point.
– Lightness Races in Orbit
Nov 23 '18 at 18:05
@LightnessRacesinOrbit Indeed. As a matter of fact, the sun can only possibly be directly overhead in latitudes between the tropics of Cancer and Capricorn. This is called Lāhainā noon. For the two tropics, Lāhainā noon occurs exactly once per year. For latitudes strictly between the two tropics, it occurs twice per year.
– scottbb
Nov 23 '18 at 21:06
@scottbb That's right.
– Lightness Races in Orbit
Nov 23 '18 at 21:26
1
For all intent and purpose - A full moon is seen with reduced contrast because mountains on the moon cast little or no shadow when the moon is seen from the earth as a full moon.
– Alan Marcus
Nov 24 '18 at 1:01
[Solar] noon is when the sun is at its highest point of the day, not necessarily directly overhead. Indeed it's very rarely directly overhead any given point.
– Lightness Races in Orbit
Nov 23 '18 at 18:05
[Solar] noon is when the sun is at its highest point of the day, not necessarily directly overhead. Indeed it's very rarely directly overhead any given point.
– Lightness Races in Orbit
Nov 23 '18 at 18:05
@LightnessRacesinOrbit Indeed. As a matter of fact, the sun can only possibly be directly overhead in latitudes between the tropics of Cancer and Capricorn. This is called Lāhainā noon. For the two tropics, Lāhainā noon occurs exactly once per year. For latitudes strictly between the two tropics, it occurs twice per year.
– scottbb
Nov 23 '18 at 21:06
@LightnessRacesinOrbit Indeed. As a matter of fact, the sun can only possibly be directly overhead in latitudes between the tropics of Cancer and Capricorn. This is called Lāhainā noon. For the two tropics, Lāhainā noon occurs exactly once per year. For latitudes strictly between the two tropics, it occurs twice per year.
– scottbb
Nov 23 '18 at 21:06
@scottbb That's right.
– Lightness Races in Orbit
Nov 23 '18 at 21:26
@scottbb That's right.
– Lightness Races in Orbit
Nov 23 '18 at 21:26
1
1
For all intent and purpose - A full moon is seen with reduced contrast because mountains on the moon cast little or no shadow when the moon is seen from the earth as a full moon.
– Alan Marcus
Nov 24 '18 at 1:01
For all intent and purpose - A full moon is seen with reduced contrast because mountains on the moon cast little or no shadow when the moon is seen from the earth as a full moon.
– Alan Marcus
Nov 24 '18 at 1:01
add a comment |
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1
Does photo.stackexchange.com/a/83792/47295 answer your question?
– Peter Taylor
Nov 22 '18 at 20:14
@PeterTaylor not completly I already tried bracketing, and 5 ago minutes repeated the process changing from full-format to aps-c which looks bit better. I will add one of these images later to refine the question, thank you for pointing me to this post.
– stacker
Nov 22 '18 at 20:45
Upper photos look slightly out of focus. Or is this the difference between 1/80 and 1/250 shutter speed? Unlikely.
– IMil
Nov 23 '18 at 1:39
IMO the second image is sharper than the first, even if it has poorer contrast.
– Darren Ringer
Nov 23 '18 at 14:24
2
Next time you are out experimenting, take at least ten exposures for every different setting and variable you are comparing. You'll see that with the moon, and many other astronomical subjects, there can be significant shot-to-shot differences from one frame to the next using the same exact settings. This is due to the effect of the Earth's atmosphere.
– Michael C
Nov 24 '18 at 11:51