John Francis wrote:
On Fri, Jul 22, 2005 at 11:18:07AM -0400, P. J. Alling wrote:
Kostas Kavoussanakis wrote:
Not true, the viewfinder is irrelevant to auto focus. The camera
doesn't use the viewfinder for focusing, you do. Viewfinders are only
for aiming and composition in AF, that's why it's brighter, (though the
LX with a modern screen is also brighter and is very good for
focusing). Their importance in focusing is minimized. There is no
technical reason why a viewfinder needs to be smaller, the reason for
that is cost. (Well sensor size has something to do with it as well but
still cost rules).
Not really. See below.
There's no cost saving in making the viefinder image smaller (unless
you go really cheap, and substitute a pentamirror, in which case the
smaller image size compensates for the additional light losses).
Oh dear... here I go again!
What additional light losses?
A front surface mirror, like pentamirror surfaces almost MUST be, loses
no light at all from simple reflection. Does it?
Any medium, be it air or glass, has a refractive index, and as a result
thereof, impedes the light transmission. No?
Just wondering...
The reason viewfinder images got smaller is because there was a lot
of additional information being displayed as well as the image. To
get all that stuff inside a comfortable viewing angle something had
to give.
Precisely so.
Increasing the viewing angle wasn't an option; having to
move your eye around to see all the viewfinder information is a pain.
Right.
There are always compromises, aren't there.
Depends on what's the most important to you.
keith
