Well all the methods have been mentioned.. Smaller chip = target fills more frame, film is larger than digital therefore on film targets will look smaller in the frame..
Doug's method is great.. 3 different scopes for different jobs.. I have 3 scopes that can be used for imaging also, but the 11" SCT can be used at F/10 or F/6.3 to allow more field of view for bigger targets etc... its good to have a couple of options..
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