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So now to really iron out the diagonal and focuser questions.
My tube diameter at the top end of 340mm and I'm not going to make it smaller, but that means I can have a really low profile focuser. The focuser will be Jerry Oltion's design on his trackball scope and I was thinking of mounting the focuser upside-down from the focuser board. I can do that as long as it's smaller than 45mm which I can also do, then in theory I can focus really really close to the edge of the light path, or still focus at the normal low-profile distance. The only problem I can see would be the focusing knobs but that should be easily fixed once it's all assembled. If I did all that I think I could get away with a 52mm diagonal mirror. The reason I was wanting to do that was because I really don't want to change the upper ring and it lets me put the focal plane close to the light path. This is my first go at ATM so what are the thoughts of those with experience at ATM?
Thanks for all your help in advance and also to those who have already replied.
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