There were some threads concerning the brightness of focusing screen before
without any conclusion, here I have some data just measured with my OM4Ti
and 50/3.5, target to a light color wall, place a light meter behind the
viewfinder and take some readings with four different FC (with comments on
the smoothness of screen) :
OM4Ti with
OM 2-4 --- 4 +0.6EV (extremely fine)
Minolta 7000 --- 4 +0.3EV (fine)
Canon EOS 620 --- 3 +0.7EV (very fine)
OM 1-4n --- 3 +0.1EV (coarse)
OM2n with Canon EOS 620 screen --- 4 +0.2EV
Other observations:
- With large aperture lenses, the brightness between different FC is less.
Some people said the OM series 1 and 2 screen look no different, they might
have used a 50/1.4 and compared with OM4 and OM2n.
- Minolta 7000 FC is not as bright and fine as OM 2 series FC but focus
better with large aperture wide angle lenses.
- I own a Beattie screen before, (by memory) it is very similar to Minolta
FC, but it vignette with my 16mm fisheye. If you can find a used Minolta
FC, it is a more cost effective approach.
- The finer the screen the better it works with small aperture lenses, a
200/f4 with 2X-A works very well with the OM 2 series screen, but not so
good with large aperture wide angle.
The Canon screen I damaged is the best I have ever seen, it is extreme
fine, the brightness is close to the OM 2 series screen but focus equally
well with wide or tele lenses, I will try to find out what it is later.
C.H.Ling
----------
> From: Glen Lowry <lowry@xxxxxx>
> To: olympus@xxxxxxxxxxxxxxx
>
> This post doesn't have anything to do with cleaning screens, but I wanted
to
> follow up on C.H.'s discussion of alternative focusing screens.
>
> In a nut shell I'm looking for the brightest focusing screen available
for
> my OM-1n & 2n. I've been toying with get a Beattie screen but I don't
know
> if it is worth the money or if there is something else I might consider.
> Now that I've officially weaned myself from autofucus, I'm looking for
> something (other than a headlamp) that will help me to shoot in the dark
> (with a 50/1.4 or 55/1.2).
>
> Glen
>
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