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There are a couple of ways that I used before getting DSLR Focus (300D) and they depend on what sort of photography you are thinking of. Widefield using a standard camera lense, I have been known to hold an eyepiece up to the viewfinder and use that. Some lenses seem to work while others don't. I then focus on the brightest light in distance I can find. About 20 km for me.
Hint: make sure you adjust the viewfinder diopter adjustment for your eyes first.
If you are widefielding it using an Orion ED80 you can try the previous technique or try using a hartmann mask.
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