Re: I need a bigger tripod

So, you can view at full aperture and it will stop down when you release the 
shutter, but its not meter coupled, is it?
Tom

Doug Herr <telyt@xxxxxxxxxxxxx> wrote:
on 10/27/04 8:24 AM, Gary Pinkerton at gpinkcp@xxxxxxx wrote:

> How much do you think that sucker weighs?

The Canon Museum 
(http://www.canon.com/camera-museum/camera/lens/f_lens.html) says it's 5.35
kg. Informal comparisons I've seen between the newer EF 400mm f/2.8 L IS
and the non-modular Leica 400mm f/2.8 APO-Telyt show the Telyt has an edge
at full aperture. The EF lens is supposed to be better than the FD lens so
the Telyt will perform better but for the difference in cost I can live with
Canon L performance.

Last night I peeked inside to figure out what had to be done to get the
auto-diaphragm working. The Leica aperture control lever rotates clockwise
and the Canon diaphragm controls operate counter-clockwise, at different
angular rates per f-stop. The technician who did the work added a pivoted
linkage to reverse the direction, with arms on either side of the pivot
having lengths proportional to either side's angular rates - very solid,
simple, well implemented. I'm impressed.

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



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