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I've looked into this and found that the green pointer throws a beam, whereas the red one doesn't, and I think it would be really difficult to see a red dot on a star sixteen zillion miles away.
My intention is to mount it on my cameras hot shoe, align it, and use it to get me into the ballpark with finding what I intend to image, without looking through the viewfinder or using live-view. Be aware of not using it if aircraft are in the vicinity, gaol is not a good place to be from what I've heard.
As I'm sure you are aware, looking through a DSLR's viewfinder at a night sky can be pretty underwhelming, particularly trying to find that one speck of light.
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