Ok math experts out there, how can you calculate the angle of view across
the width of the frame for any given lens using the angle across the
diagonal as a reference - we can get the diagonal from the OM brochures.
The Olympus literature defines the angle of view of a lens as the angle
across the diagonal. I guess this is where the rectangular image "sits" in
the field of the round lens elements. As an example they quote the Zuiko
21mm as having a angle of view of 92 degrees across the diagonal but across
the width of a frame will be something less about 88 degrees?
I think knowing the angle of view across the width is a more useful figure
especially when doing some architectural photography.
Tim
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