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  #44  
Old September 29th 05, 03:03 PM
Scott Schuckert
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In article , Randall
Ainsworth wrote:

An f/2.8 lens is going to allow a specific amount of light to go
through regardless of what kind of glass it's made of.


Ahem. Notice the previous 50+ responses in this thread? If not, read
some - you're dead wrong. What you're thinking of is a T-stop. Lenses
of the same mathematical aperture (f/stop) can and do wary widely in
transmission. Period.