Originally posted by Solidus Green eye
Some of the pics have the stars cut out again.
Cool photographs!
It's also possible that because of the relative brightness of the subject matter, the exposure time was too short to capture the light of the
stars.
If I went outside on the starriest of starry nights and took a picture of a streetlight bulb, the camera would need to be set to a short exposure time
to see the streetlight without "overexposing" the bulb. That short exposure would not be long enough for me to capture the light from the stars.
Perhaps if the exposure time was set long enough to see the stars in these photos, the subject matter (Saturn, its moons and its rings) may be so
overexposed as to not see any detail.
If the subject matter happens to be a dim moon, then perhaps the stars would show, because the exposure time would be longer.
In fact, the one photo of Titan where the stars really show up even mentions that Titan was being eclipsed by Saturn -- and therefore in Saturn's
dark shadow. Obviously the exposure time was long with that photo.
Although the first picture is said to be a mosaic of 72 smaller photos, so it is possible that for that one any stars that showed on the image were
removed -- or else there may have been stars that showed up multiple times in the mosaic, creating a pattern that would have detracted from the beauty
of the image.
EDIT TO ADD:
Beautiful pictures, by the way, OP!
[edit on 10/20/2009 by Soylent Green Is People]