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<blockquote data-quote="WyoDuner" data-source="post: 162626" data-attributes="member: 14602">Correct - the software superimposes each frame and matches the correct stars together.&nbsp; The advantage, in the case of these 2 images, is that stacking is a good way to significantly reduce any random noise that occurs on each image.&nbsp; I had to shoot at ISO 2000 and 3200 at 20 seconds so I had a good bit of noise in each image.&nbsp; The stacking software is smart enough to know that if something is in one image but not others it is probably not wanted and probably noise.&nbsp; So, while each image does have noise it is different in each one and the stacking software basically removes it.&nbsp; Stacking can also be used to effectively increase your exposure time by aligning the images then adding exposure up instead of averaging the exposures.&nbsp; For star trails (which I have not yet tried - still new to all of this) you would stack the images together but NOT align them.&nbsp; You can do this in Photoshop fairly easily and no need to use dedicated stacking software.&nbsp; Next dark night I would like to attempt some star trails.</blockquote>

[QUOTE="WyoDuner, post: 162626, member: 14602"] Correct - the software superimposes each frame and matches the correct stars together. The advantage, in the case of these 2 images, is that stacking is a good way to significantly reduce any random noise that occurs on each image. I had to shoot at ISO 2000 and 3200 at 20 seconds so I had a good bit of noise in each image. The stacking software is smart enough to know that if something is in one image but not others it is probably not wanted and probably noise. So, while each image does have noise it is different in each one and the stacking software basically removes it. Stacking can also be used to effectively increase your exposure time by aligning the images then adding exposure up instead of averaging the exposures. For star trails (which I have not yet tried - still new to all of this) you would stack the images together but NOT align them. You can do this in Photoshop fairly easily and no need to use dedicated stacking software. Next dark night I would like to attempt some star trails. [/QUOTE]

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