[petee]

Beautiful, like I needed a new crossover of hobbies; btw could this fill a 220 format frame?

You also could save a lot of weight by boring out your plywood base and still be plenty rigid

[chantepierre]

I'm sorry, I did not find what you meant by a 220 format frame. Is it a film photography type ?

[platinum95]

220 is a roll film, essentially the same as 120 film, just a longer roll. It's 6cm wide, and picture format depends on the camera/lens, varying from 6x4.5 up to 6x7 (and beyond, for panoramic shots).

So for use with your telescope, it'd need to produce an image circle that'd cover at least 6cm.

[chantepierre]

Thanks for the clarification. I don't think so, my largest eyepiece has a field stop of 39mm, and I'm taking advantage of the fact that edge illumination falloff is not perceptible in visual astronomy when the f/D ratio is low.