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Old 17-10-2016, 04:37 PM
Wavytone
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Join Date: Jul 2008
Location: Killara, Sydney
Posts: 4,147
Well, I have messed with camera lenses before - at one point I had a 600mm f8 mirror lens mated to an Edmund RKE 28mm as a finder, and a Russian MTO 1000mm f10 similarly set up. Both had T rings to suit 42mm screw mounts.

The snag with both of these - and your camera lenses - is that the back focus distance is so short you'll find very few 1.25" eyepieces will reach focus by the time you have managed to get an eyepiece adapter on. With a star diagonal, very few eyepieces will fit.

The second problem is that old-school camera lenses are not diffraction-limited -not even close - the result being that at high magnification, looking at bright stars or planets is going to be rather disappointing.

Have fun...
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