Why no mirror telephotos for DSLR Canon?

Started Jan 25, 2010 | Discussions thread
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macshark Senior Member • Posts: 2,848
4 reasons

1) Poor contrast
2) Manual focus
3) Fixed aperture
4) Fixed focal length

There is also no-IS but this may be a non-issue for other brands that have sensor based IS in the body...

If you really want one, there are a few companies that still make 500mm-600mm MF mirror lenses. For longer focal lengths, you can use a refractor telescope with T-mount adapter.

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