Split image rangefinder spots in SLR focus screens are effectively
rangefinders with a base distance the width of the front element of the
lens. So, accuracy with those varies with focal length and lens. Generally
a rangefinder base should be at least as long as the focal length (ideally
longer) for any reasonable accuracy.
Stock canon screens will show DOF changes below f/2.8-3.5 in my experience.
The EC-s will show differences below about 2.0-2.8, about a stop better (and
darker). I use the EC-s on the 1v when I shoot 35mm. It's a good screen,
probably as good as it gets for canon and manual focus lenses.
-Ed
On 1/5/12 6:16 AM, "olympus-request@xxxxxxxxxxxxxxxxx"
<olympus-request@xxxxxxxxxxxxxxxxx> wrote:
> Of course, we're talking about the matte area of
> the screen here - the split-prism variant is extremely accurate,
> showing me focus differences with my 21mm lens - such as focusing
> between 4m and 6m - which wouldn't even really show up on the film.
>
> As somebody who came from Canon DSLRs, this is still better than their
> standard focusing screens (I switched to the Ec-S very quickly) which
> look pretty much the same even at f/4.0 to f.5.6.
--
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