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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: "Tom Trottier" <infoanim@xxxxxx>
Date: Wed, 14 Jul 1999 14:36:34 -0400
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.
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