Hi Warren. I had trouble with focus with my DSLR as I had no live view. I purchase a right angle view finder on E-bay for $35. it allow you to magnify the image in the viewfinder by 1.5 or 3x. Then you can see the star better to focus. I still use a Bat Mask as well. Its a great help and the best $35 i spent
Mardy
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