The following photos show the effects of increasingly smaller lens
openings (larger f/stops) on the center band of a beamsplitter image.
These photos were taken with an SKF-1 beamsplitter on a 50mm lens.
Note that the center dark band increases with smaller lens openings
(larger f/stops), limiting the the use of small f/stops for increased
Note how, in the left-hand image, the magazine is smaller
on the right side, and in the right-hand image,
the image is smaller on the left side. Whether or not
this is objectionable is somewhat subjective. This is
keystone distortion. When the beamsplitter
is used as a viewer, this distortion is cancelled out, but would be
present, for example, in a photo taken with a beamsplitter but viewed
without one, as in a beamsplitter print which is free-viewed.
This photo was taken with an SKF-1 beamsplitter.
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