--- Henry Posner/B&H Photo-Video
<[EMAIL PROTECTED]> wrote:
>
> The alignment of the eye to the optical center of
> the finder at f/8 or slower to realize both halves
> of the split image is so precise that for ANY
> practical purpose it is rendered useless in
> the field.
Hi Henry,
A week ago I'd have agreed, but after recently
installing an E-B split screen in my RT, I checked
(after reading Julians post) the ability to manually
focus at smaller apertures.
The slowest lens I have is f5.6 (and no
teleconverter), so I used the DOF preview feature on
the RT to stop the lens down to f11 and I could
manually focus the lens using the split image without
*too* much difficulty. It did show a tendency to
blackout if my eye was too far off the centreline, but
it was quite usable. This was done indoors, so the
light levels weren't overly bright either.
Actually the most difficult thing was doing 3 things
at once: holding the camera with one hand, using one
finger to hold down the DOF button and a couple of
other fingers from the same hand to focus. If I owned
a TC it would have been much simpler.
Needless to say I was *very* surprised by this result,
as I'd always found in the past that f5.6 was the
practical limit for split screens. As I've said in
previous posts, I can only assume it has to do with
the angle of the splits. Not a scientific test by any
means, but an enlightening one nonetheless.
Regards
Gary
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