Check here:
<http://zuserver2.star.ucl.ac.uk/~rwesson/esif/om-sif/findergroup/focusingscreens.htm>
The standard advice would be to use a 1-4 screen on an OM-1 or OM-2 and
a 2-4 screen on an OM-2s and later bodies. The 2-4 screen is brighter
than the 1-4 in order to compensate for the light lost to the metering
sub-mirror on the later bodies. While not designed for the OM-1 and
OM-2 the 2-4 screen can be used there by trimming the grip tab that's in
a slightly different position to prevent its installation in the early
cameras. The reason is that the meters on those cameras don't work
properly with a 2-4 screen but the meter can be adjusted or you can
compensate in other ways. If you want a 2-4 screen the big problem may
be finding one. Just like the 2-13, they are rare and expensive.
Another possibility. I don't know for sure but seem to recall that the
(fixed) focusing screen in an OM-40 (OM-PC) is the equivalent of a 2-13
screen. A 2-13 is brighter like a 2-4 and has the same center focus
aids as the standard 1-13 but that might not be a problem if your
trouble is the outer edges of the frame. I just can't recall whether
it's easily adapted or not but it certainly doesn't have a grip tab even
if all the dimensions are correct. Dead OM-40/PC bodies can be had
cheaply and robbed of their screens.
I've never had a Beatty screen but I seem to recall that the surface is
coarser.
BTW, when was the last time you had your eyes checked? When I first got
my OM-1 in about 1976 I could focus on anything. Today, even with
glasses, I have to depend on autofocus for anything beyond hyperfocal
methods. Good DOF frequently saves me from myself.
Chuck Norcutt
Dawid Loubser wrote:
> Hi All,
>
> What would you consider the best focusing screen (for focusing
> accuracy on the matte area, especially
> towards the edges of the frame) ? Especially with the 50mm f/1.4,
> although my other two most-used lenses
> is the 24/2.0 and 90/2.0 macro.
>
> The standard prism/microprism/matte screen is OK, but it's not great
> on the matte area, I am used to much
> more precise Canon 1-series matte focusing screens (surely matte-
> screen technology has evolved since
> the seventies). I am having a hard time seeing the 'sharp' plane of
> focus towards the edges of the screen.
>
> If it doesn't mess up the light-meter reading, all the better,
> although I do use incident metering 90%
> of the time in anyway, so it's no big deal. Should I be looking
> Olympus, or are other screens like
> Beattie Intenscreen better?
>
> thanks for any advice,
> Dawid
>
>
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