OT - Flash Photography
snip
One thing, that surprises me if you claim to have expert knowledge in
the field, is one advantage not having a pentaprism and mirror
combination, it unties the hands of lens designers, leading to simpler
and more efficient lenses.
Yes. The lens designer doesn't have to make allowance for the clearance required for the mirror. Lenses can be more compact and wide angles are simpler to make
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