Hi Per:
OTF would be a type of TTL operation, as would metering in the prism, metering
on the mirror, metering through a semi-silvered mirror, metering through the
lens using a swing away arm, etc. One advantage of OTF is that it registers
changes occuring while the exposure is in progress. One disadvantage is that
not all film surfaces have the same reflectance. (Oh boy, here goes a thread
on film surface reflectance!)
Gary Reese
Las Vegas, NV
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