On Fri, 22 Jul 2005 12:47:59 +0200, Kostas Kavoussanakis
<[EMAIL PROTECTED]> wrote:
On Thu, 21 Jul 2005, Graywolf wrote:
A. Focus screen optimized for brightness rather than accuracy.
B. Focus on the lens loose so the AF motor does not have to be too big,
rather than optimized for smoothness and accuracy by hand.
C. Viewfinder image of low magnification.
A. I don't understand. But what does it have to do with AF.
B. has nothing to do with the body (we were talking about fighting
it), so it does not answer the question. Fit a MF lens that you like
on it and the AF camera is not compromised.
C. What does it have to do with AF.
In other words, is there a technical reason why AF tips the balance
towards brightness, rather than accuracy and is there a technical
reason why AF causes viewfinders to go small.
Hi Kostas,
Technical reason would be that part of the light (35% according to the
KMP!) entering the lens needs to go to the AF-system. This makes the VF
dimmer. By optimising the screen for brightness and by reducing the
magnification (concentrating the remaining light on a smaller area) this
can be compensated.
Regarding C: 'history' supports the suggestion that magnification is
linked with AF-MF: For MF K-mount bodies, the magnification is between
0,82 and 0,97. For Af it's between 0,70 and 0,82...
Hope the above is correct, and helps,
--
Regards, Lucas
