It's a one touch, which would render the aspect of keeping it in focus
while zooming difficult at best.
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On
Behalf Of Chuck Norcutt
Sent: Wednesday, July 12, 2006 8:44 AM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: OT - focus screen alternatives for 5D
I've been thinking about ordering one of these but it wouldn't help in
your case with such slow lenses:
<http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details
&Q=&sku=402221&is=REG&addedTroughType=search>
ps: Is the 50-250 parfocal? Can you focus first at the long end and
then shorten it up and stay in focus?
Chuck Norcutt
Jeff Keller wrote:
> Thanks to a tip from Scott, I picked up a "Brightscreen" for my 5D for
> ~$40
> (Thank you Scott!). After using it for a week in a slightly too warm
> tropical climate with some slow lenses I have doubts that it is better
than
> the original plain screen.
>
> Before leaving on vacation I took some shots of my daughter using a
> 450/4.5
> cat lens inside my house at night. The split image seemed to work. I
left
> the screen in my camera when I went on a vacation trip.
>
> While on vacation I found the 50-250/5 Zuiko quite hard to focus at
> the
> short end. I also found the 350/5.6 cat lens would not give a
completly
> illuminated split image. The split image circle plus microprism donut
in the
> bright screen is quite large. When it darkens a big portion of the
image
> can't be used to judge focus.
>
> Overall I would say a 1-13 screen in an OM works better for slow
> lenses than
> the Brightscreen. If you are using lenses faster than about f4 and
have
> sharp contrast lines in the view to take advantage of the split image
then
> the Brightscreen would probably be better than the original plain
screen.
> I'm hoping to find time to carefully compare the Brightscreen to the
> original screen but I suspect that I will go back to the original
screen.
>
> -jeff
>
>
>
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