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Hi Paul, On nights of superb seeing and the consequently stable atmosphere, or the best possible AP sites such as many mountain tops offer, single images
can approach the quality of stacked video images, but in most cases stacking
is the way to go because it is rare to get the whole surface of the moon
pin sharp at any one point in time from our everyday[or night] AP sites.
The software's job is to select the best frame for each part of the image
from the thousands of images that are stacked. You can be lucky and get a
very nice single image, but the finest images out there are pretty much all
stacked. To answer Jeremy's comment, planetary imaging is always stacked for the same reason, except that the advantage of stacking is much greater;
no single image of the planets will come anywhere near the quality of a stacked one.
raymo
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