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spotting scope adapter for Canon EF lenses?

Peter Lyons , Dec 13, 2005; 10:17 a.m.

Following up on this post:

http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=005Wkx

I'm wondering if anyone knows of an adapter that would allow me to use a Canon EF telephoto lens as a spotting scope. To clarify, I'm not looking to adapt my camera to take photos through a spotting scope, rather, I want an eyepiece that will attach to the mount on my telephoto lens, such that I can use it as a spotting scope. Thanks for any information!

Peter

Responses

Rob Murray , Dec 13, 2005; 11:43 a.m.

Canon never made one for the EF lenses. Nikon made one for some of their older lenses. Maybe someone has made one of these might check Ebay. I would think with a rear lens cap, good low power telescope eyepiece if your handy you could probably make one.

Mike Gammill , Dec 13, 2005; 04:27 p.m.

I think the old spotting scope adapters had a small roof prism to erect the image. You could make an eyepiece holder with the endcap, but the image will be upside down. Very easy to figure magnification: divide focal length of lens by focal length of eyepiece. A 10mm eyepiece on a 75-300 lens would give a 7.5 to 30x magnification. To erect the image you could get a cheap 45 degree diagonal to hold the eyepiece. More trouble than it's worth?? Maybe, but I might be fun.

Jorge Garcia , Dec 13, 2005; 05:36 p.m.

I made one using the female part or a cheap (without electronic contacts) extension tube and a "scope converter" for Minolta lens (used Minolta because has big diameter easy to join to the extension tube), firast tried a M42 one but it was very small Both parts bought at ebay

Tommy Lee , Dec 15, 2005; 02:10 a.m.

I have seen spotting scope adapter for Canon FD, Leica, Minolta, Nikon, M42 and T-mount lens. The Leica is still in production and the M42 seems to be still in production as well (most available)made by a Russian company. You can find the M42 version in ebay for less then $25. The others are more expensive. I have seen it gone up to $375 (nikon version) There is however none available for Canon EOS lens. These scope adapter all has optic in it to turn the image right side-up.

Richard Cooper , Mar 24, 2006; 03:45 p.m.

Jorge Garcia, I appreciate your answer and ask if possibe to be more specific in how you made the adapter. Any pic available?

I made one using the female part or a cheap (without electronic contacts) extension tube and a "scope converter" for Minolta lens (used Minolta because has big diameter easy to join to the extension tube), firast tried a M42 one but it was very small Both parts bought at ebay

Thanks Richard Cooper

Jorge Garcia , Mar 26, 2006; 06:06 p.m.

Richard, first I bought a "scope converter" for Minolta lenses. I bought it at Ebay, it was not the Minolta brand because it is very expensive. Then I bought a set of cheap extension tubes also at Ebay. These tubes have not electric contacts, that is why they are so cheap.

I cut off the bayonet female part of the scope adapter and put there the first part of the extension tubes, that part has a Canon EF female bayonet and a thread for the next extension tubes (not used)

As already said, this extension tube fits over the Minolta adapter so you only have to worry about the register distance (it is 43.5 or 44.5 milimeters for Minolta and it is 44mm for Canon EF) You can put some tape to join both parts while you test it, then glue.

Sorry but my english is not good for this kind of explanations If you want I can try to upload some photo Regards

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