Why no mirror telephotos for DSLR Canon?

Started Jan 25, 2010 | Discussions thread
Paul De Bra
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you forgot the bokeh reason
In reply to macshark, Jan 27, 2010

A mirror lens blocks the center bit of incoming light and this results in torus-shaped out of focus highlights. Not nice to look at at all.

macshark wrote:

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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Slowly learning to use the 450D and and the Canon G6.
Public pictures at http://debra.zenfolio.com/ .

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