Re: the Canon Noctilux...

The microprism collar on the Katz-Eye screen works sometimes, but the fine microprisms surrounding it are usually better. The rangefinder split isn't accurate enough for much of anything. The Katz-Eye is designed to avoid darkening its focusing aids for apertures to f/11.
Today with 1000mm f/8, I had to use manual focus with an American brown pelican in breeding plumage. They're rare up here at this season. The EOS 1D mark II has a center sensor only for AF with lenses f/8 and slower, but most of the time I just skip it and use MF. The 1D mark II's relatively bright viewfinder makes it easier than it would be with the 20D. 

Mark Bohrer
Wildlife Photography on the Urban Edge
www.mountain-and-desert.com



At 05:39 AM 12/20/2006, you wrote:


On Dec 19, 2006, at 11:10 PM, Mark Bohrer wrote:
The 400mm f/6.8 Telyt is a challenge to focus for flight shots on the 20D, even with a split / microprism screen.
I hope you're not trying to use the split-image or microprism for focusing the 400 f/6.8! Use the matte area of your viewscreen instead (or, the extremely fine microprisms of the SL that works like the matte plastic of a typical viewscreen, only brighter and clearer).
I found that when my eyes started having problems the SL's viewfinder was a good solution to the focussing problem. Now, 15 years later, it's still quick and easy to focus the 560 f/6.8 + 1.4x extender accurately on the SL. 

Doug Herr
Birdman of Sacramento
http://www.wildlightphoto.com


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