From: "Stanley A. Gorodenski" 
To: atm{at}shore.net
Reply-To: "Stanley A. Gorodenski" 


I know how to calculate the image size in inches at the prime focus for my
telescope. For example for my telescope, 1.459 seconds of arc of the sky
forms an image at the prime focus of 0.0013 inches. I want to know what the
image size will be using an eyepiece projection technique. The thin lens
formula appears to requires information I do not have readily on hand for
my orthoscopic eyepieces, and in addition the eyepieces are not thin
lenses. Does anyone know of an approximation formula for determining image
size within about 10% either way of the actual image size?

Stan Gorodenski

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