Chuck Norcutt wrote:
> No, regardless of the size of the viewfinder and a whopping big mirror
> you can't have a really bloody bright viewfinder with an f/4 lens.
>
As a matter of theory, I'm not sure I agree. Although the brightness per
area is the same with the same speed lens, the total amount of light on
the focusing screen is greater. So when concentrated into the same size
visual image, the larger format camera, with same speed lens, should
have a brighter image.
As you say, MF lenses tend to be slower, but the factors should more or
less balance out, in theory.
I suspect this in not true in practice because of compromises in the
design of MF viewfinders. I suspect the problems of size, weight and
cost go up with something like the cube of the film diagonal with
pentaprism finders. The penta prism is much bigger and the eyepiece
optical system has to cover a much greater area. The eyepieces are
probably also slower for size/cost reasons.
Moose
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|