[h0ughy (David)]

Originally Posted by jerry3672

I did my share of testing. They all worked except for one. I sent a design to John for his 80mm. We had the bright idea that you could print the pattern on a clear transparency and it would work. The transparency changes the focus just like adding a filter to the eyepiece. The spikes were dull and not in the center when the ccd was in focus. My last design is what i posted here. It is very forgiving to the focal ratio. Still the bigger scopes put up a brighter pattern. I can focus my dsi with my sn-8 down to a mag 6 star with no problems. This is nice when your target is not near a bright star.

thanks for the reply