Henning Wulff wrote:
>If you have one object behind the other, you will discover a parallax
>error between what the taking lens sees and what the viewing lens on
>a TLR sees, no matter the masking that's going on. Also note that the
>Rollei with its masking covers what is no longer seen at closer
>distances, but cannot _add_ what the taking lens now sees but the
>viewing lens no longer does. The masking can only cure part of the
>problem.
Half true. The mask actually slides down showing more bottom and darkening
more of the top as you focus closer. In other words, at infinity the bottom
is covered the top open. As you focus closer, the frame moves downward
showing a constant square of exactly (or very very close) to what the
viewing lens does. I guess this is why they call it parallax compensation
as opposed to Parallax correction.
Only the Voigtlander Superb actually had a viewing lens that tilted/pivoted
downward as you focused closer. This was their way around the Rollei patent
for the frame.
>Your Koni-Omega actually does a much better job. It, of
>course, can give you no clue as to depth of field like the Rollei
>can. Win some, lose some, but if you want to see what the lens sees,
>you have to look through the lens either by means of a mirror, or on
>a ground glass in the film plane. Oh, and you have to stop the lens
>down to taking aperture to be accurate :-).
Really the same as a Rollei but brighter since I am not limited by the F2.8
aperture of the viewing lens.
>Since the Rollei doesn't focus that close, the parallax error
>is usually not that big a deal, same as with a rangefinder. It just
>isn't good for close-ups or very precise compositions.
Not true. You have obviously not used a Rollei TLR very much. Close up
attachments made by Rollei (Rolleinars) have a special prism in the viewing
element to also compensate in conjunction with the camera. Quite
sophisticated and very accurate. I have all 3 can you can get as close as
9.5 inches from my subject with a magnification of 1:2.9. Great for 6x6cm
images of flowers, small insects, and other things you would normally
reserve for a macro.
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