Julian Loke wrote:
> Could the lack of blackout be due to the large diameter of the
> Canon EF lens mount? Or that the lenses are so accurately
> centered due to excellent design and manufacture?
Julian, you are joking, aren't you? Canon EF lenses, with some
exceptions in high quality L lenses, aren't really well centered. This
has been shown in dozens of lens tests of EF lenses.
Whether a split image focusing aid blacks out or not has to be a matter
of it's optical design. There are several different screens with split
image for the EOS 1N. One of them is secified not to black out with slow
lenses, the others aren't. So I guess those DO black out with slow
lenses.
Thomas Bantel
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