[LRflex] Re: a 4/3 sensor to match the 36mm size?
- From: David Young <telyt@xxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Mon, 03 Dec 2007 17:27:18 -0800
Dave Saalsa offered:
The only problem is the mirror size with a larger than full 24 x 36
mm format. Clearance with the rear element is an issue. Coverage
of the circle of confusion is not the issue here. The lenses will
cover anything up to 36 x 36 mm. But mirror clearance is the issue
as I see it and the larger the mirror the slower the max. shutter speeds.
Mirror size may not be a problem. The original Leica mount was
designed so that the mirror could flip up. The mount was deep enough
that when long lenses were used, there was not any finder
cut-off. (Remember, finder cut-off results in a dark band at the top
of the finder, when very long lenses are used, but does not affect
the image, as photographed.)
When they tied up with Minolta, they learned the trick of hinging the
mirror so that it swings up and back. This allowed the use of a
mirror which yielded more clearance at the back of the lend. Using
this trick we might see a mirror that works for most lenses, but will
not allow the use of the one or two current optics which need that
extra clearance. There might also be a return of finder cut-off with
lenses 400mm+ in fc. However, it would work, perfectly, with
shorter FC lenses, which are the norm for most, except for Doug and I.
They may, of course, have other tricks up their sleeve which will
prevent the "dreaded" mirror cut-off.
As Doug said ... it will be interesting to watch what they do!
Cheers!
---
David Young,
Logan Lake, CANADA
Wildlife Photographs: http://www.telyt.com/
Personal Web-pages: http://www3.telus.net/~telyt
Stock Photography at: http://tinyurl.com/2amll4
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