: I was wondering if it would be possible to make a refractor from a high quality camera telephoto lens. Any suggestions appreciated.

Hi Steve:

A lot would depend on the telephoto. If you have one of those 800mm f:8 Kaligars then just add an eyepiece. If you have one that has a small front element and/or a lot of elements or is a zoom then maybe you should sell it and buy a lens that fits your needs. I have seen 50mm Achromats for $10 and I have seen 80mm for as low as $20. These would have more usable f-ratios than most camera telephotos. You want something that will match up with your eyepiece and eye and give good eyerelief. A fast camera lens will not and if you take the extra elements out you probably will end up with a very poor image.

If you still want to keep the telephoto as a camera lens you can make or buy a telescope adapter. Good Luck, -Rick