I have several telephoto lenses (with the old screw thread fitting) which I don't use much on my camera. I know it is possible to get an eyepiece to fit on to the back of the lens, to turn it into a high quality telescope.
Does anyone know where I can buy this device in the UK, and how much would it cost?
If I used such a device with a 135mm lens, what magnification would it give me when operating as a telescope? Try http://www.surplusshed.com/pages/item/t1...
However, you are going to be *very* disappointed with the view quality.
There is no way to turn a camera lens into a "high quality" telescope. Telescope objectives and camera lenses are made for different purposes and to different standards. A camera lens can get by with poorer quality of image because the image is not going to be magnified 200x by an eyepiece. At the same time, a telescope doesn't need to project an image that is flat and large enough to cover the fil, size.
If you really want a telescope I have two different suggestions to try instead. Go to astromart.com and watch the used telescopes. But the best suggestion is to go to http://skyandtelescope.com/resources/org... and find your local astronomy club. They will have public nights. Go to a public night. You will get to look through a lot of different telescopes. By the end of the night you will know what you want. And, you are likely to come across a very good deal from someone who wants to sell their telescope and upgrade.
http://groups.yahoo.com/group/lunar-obse...
Chuck Taylor ^
Ditto.
You'd probably be better off buying a spotting scope--some of which can easily be converted into telephoto lens--rather than the reverse process. | 