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I'm sorry, I did not find what you meant by a 220 format frame. Is it a film photography type ?
by chantepierre 3mo ago
I'm sorry, I did not find what you meant by a 220 format frame. Is it a film photography type ?
- platinum95 3mo ago220 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 3mo agoThanks 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.