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Re: [OM] Focusing screen characteristics: OM 2-x series vs. Beattie?

Subject: Re: [OM] Focusing screen characteristics: OM 2-x series vs. Beattie?
From: "C.H.Ling" <chling@xxxxxxxxxxxxxx>
Date: Thu, 15 Jul 1999 23:50:39 +0800
Hi Tom,

The light different between the OM 1-4n and the OM 2-4 was 1.5EV. The most
important things is the 1-series screen are very coarse, it works poorly
with small aperture telephoto lenses or telephoto with a 2x convertor (such
as 200F4 + 2x). Also, the brightness different seems bigger when the
aperture is smaller.

Sorry for posting the wrong Canon FC name, it should be E-C (there is no E-S
screen), the Bright Laser-Matte. The brightness of this screen is similar to
Minolta, it possess no grid, with finer matte.

To summaries the FCs, my subjective comments are:

2-4 -  Best for telephotos, not good for wide angles, not good for DOF
checking.
E-C -  Very good for telephotos, okay for wide, good for DOF.
Minolta - Good for telephoto and very good for wide, very good for DOF.
2-4 - Poor for telephotos, good for wide, very good for DOF.

C.H.Ling

-----Original Message-----
From: Tom Trottier <infoanim@xxxxxx>
To: C.H.Ling <chling@xxxxxxxxxxxxxx>; olympus@xxxxxxxxxxxxxxx
<olympus@xxxxxxxxxxxxxxx>
Date: Thursday, July 15, 1999 2:33 AM
Subject: Re: [OM] Focusing screen characteristics: OM 2-x series vs.
Beattie?


Thanks, Ling.

I gather from the EV readings that the difference is less than a stop
(1 EV).

Does anyone have experience with the E-S screen?

Tom

On 12 Jul 99, at 20:04, C.H.Ling <olympus@xxxxxxxxxxxxxxx> wrote:

> Hi Tom,
>
> Below please find the message I sent to the list few weeks ago, the EOS
> screen is normal Canon Laser Matte, not the brighter New Canon Laser Matte
> "E-S" :
>
> ---------------------------------------
>
> 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.
>
> C.H.Ling
>
> -----Original Message-----
> From: Tom Trottier <infoanim@xxxxxx>
...
------------------
From: Tom Trottier, President, ACT Productions Inc.
infoanim@xxxxxx                   http://www.act.ca
+1 613 594-4829                 fax +1 613 594-8944
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