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Catadioptric (Mirror) Lenses


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#1 Chris D Walker

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Posted 28 September 2008 - 07:25 AM

I've been doing some reading about these kind of lenses and have been wondering whether they have ever been used in cinematography for extremely long focal lengths and macro photography. They look as if they could produce excellent images and are constructed in a way that they are physically shorter than long and telephoto designs. I also like the ring-shaped bokeh that the mirror lenses create.

A few other questions about these lenses:

How close can a mirror lens typically focus (let's say a 500mm)?

What would be the difficulty in converting a still photography mirror lens to a PL or B4 mount?

What's the shortest focal length of a mirror lens?

Thanks for any replies and information.
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#2 Simon Wyss

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Posted 28 September 2008 - 01:41 PM

Hi Chris

It looks that you could go pretty close with mirror lenses but you'll have trouble with depth of field since you have no iris to stop the system down. Adding barrels will help.

The difficulties arise with the movie camera housing, the protruding bead around the shutter. Depends on the lens's focal length.

Short focal length ? RF Rokkor, 250-5.6

If you need a camera with reflex viewfinder but without shutter bead check this.
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#3 Simon Wyss

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Posted 28 September 2008 - 01:55 PM

The link should be: http://www.cinematog...n...st&p=250981
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#4 Bruce Taylor

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Posted 29 September 2008 - 08:57 PM

I got one with a camera package I purchased. 500mm f8, I think. Very small and light. It came with what I think is T mount to OCT19 (Russian mount for my Russian camera, said to be similar to a BNCR mt) adapter. It works well. Doesn't focus that close, but extension tubes would fix that. Since it is a still camera lens it is not geared or laid out mechanically like a cine lens.

Bruce Taylor
www.Indi35.com
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