Why no mirror telephotos for DSLR Canon?

Started Jan 25, 2010 | Discussions thread
Lee Jay
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I have a $700 1900mm f15
In reply to Franz Weber, Jan 25, 2010

Get a telescope. A great many are available in all sorts of sizes and shapes and types. Just recently you could get a C6 (1500mm, f10) for under $400. It's still only $429.

http://www.optcorp.com/product.aspx?pid=1-600-602-900-8811&tb=2

If you want, you can even attach an f6.3 focal reducer to it to make it a 945mm f6.3.

http://www.optcorp.com/product.aspx?pid=410&kw=reducer%20corrector&st=2

Want something smaller? How about a 1250mm f14 for $230?

http://www.telescope.com/control/telescopes/cassegrain-telescopes/orion-apex-90mm-maksutov-cassegrain-telescope

Or how about a short tube 80 (400mm, f5) for $120?

http://www.telescope.com/control/telescopes/refractor-telescopes/orion-shorttube-80-telescope-optical-tube

Any of these can be adapted using the T-system to Canon SLRs. I would guess the availability of small scopes is why no small "mirror lenses" are available. That and the relatively-cheap AF/IS telephotos available now (55-250IS, 70-300IS).

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Lee Jay
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