Why no mirror telephotos for DSLR Canon?

Started Jan 25, 2010 | Discussions thread
Lee Jay
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Re: I have a $700 1900mm f15
In reply to Bill MacBeth, Jan 29, 2010

Bill MacBeth wrote:

Here's what I mean by 'eyepiece projection'. I've used the technique many times on my on reflector, and on a larger refractor at a university. An eyepiece (normally used for visual observation) is moved away from the visual focal location, so that it profects a focused image about four inches outside itself. The film plane or sensor plane of the camera is placed at that location. No lens is used on the camera.

Oh. This was used with eyepiece projection through my little Canon S3IS compact, which obviously had a lens on it, with the lens set at maximum wide angle (36mm-equivalent).

This was through the same eyepiece, at maximum telephoto (432mm-equivalent):

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Lee Jay
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