See the description here:
<http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=402221&is=REG&addedTroughType=search>
I think it reduces the brightness of all lenses. You just need to start
with 2.8 of better in order to be able to focus easily.
I don't think you'll see anything from Katz Eye on the 5D. Canon
already produces 6 non-standard screens and I would guess more may be
coming.
Chuck Norcutt
Jeff Keller wrote:
> I saw a short description of an optional C*non focusing screen that is
> supposed to improve accuracy when manually focusing lenses. It had a too
> vague note that it would reduce the brightness of lenses that were not f2.8
> or faster. I wonder if anyone has used it ... ?
>
> I didn't see any screens for the 5D on the katzeyeoptics.com web site. They
> have a note on the title page that it is being researched.
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