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Re: [OM] Lenses

Subject: Re: [OM] Lenses
From: Garth Wood <garth@xxxxxxxxxxxxxxx>
Date: Sat, 28 Aug 1999 11:44:35 -0600
At 08:26 PM 8/27/99 +0100, Jenna wrote:
>Could some kind person explain what 'mirror' lenses do?


Essentially, high-powered, relatively small, light-weight telephoto lenses, 
using curved mirrors rather than glass elements.  The Zuiko (Olympus) 500mm 
F/8.0 lens is an example.  Disadvantages: unless really well made, can show a 
loss of contrast, and have fixed apertures, making them somewhat dim to view 
through and thus hard to focus (i.e., the above-mentioned Zuiko has *only* an 
F-stop of 8.0, nothing else -- there's no diaphragm, and thus, no real control 
over depth-of-field...).  Also known as "reflex lenses" (due to the 
construction which causes light beams to change direction inside the lens).

For two photos of the Zuiko, one of the lens itself and one of the lens 
compared to an OM-4Ti body (so you get an idea of the size), see:

   http://www.taiga.ca/~gallery/reflex.html

Enjoy.

Garth


 
"A bad day doing photography is better
 than a good day doing just about 
 anything else."
 
The Unofficial Olympus Web Photo Gallery at:

   http://www.taiga.ca/~gallery/


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