At 00:08 7/20/02, I wrote:
The "t" indicates "transmission." It is the f-stop of actual light
transmission as measured for that lens in a laboratory.
Forgot to add the reason cinema and special scientific application lenses
are marked with both the t-stop and f-stop numbers:
t-stop determines a very exacting and exceptionally accurate exposure
f-stop determines depth of field.
-- John
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