Why no mirror telephotos for DSLR Canon?

Started Jan 25, 2010 | Discussions thread
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PhotonFiend Regular Member • Posts: 293
mirror telephoto by opteka

I have wondered this myself and have come across these on amazon:

http://www.amazon.com/Opteka-Telephoto-Mirror-Digital-Cameras/dp/B0022VFDRK/ref=sr_1_sc_2?ie=UTF8&qid=1264446701&sr=8-2-spell

What is the purpose of this product? i cant possible be anything near "pro grade" but for a neat toy to shoot the moon and such i have wondered how how practical it would be vs. a cheap telescope and adapter.

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