Hi WKato@xxxxxxx,
At Wednesday, December 06, 2000 11:06, WKato@xxxxxxx <olympus@xxxxxxxxxxxxxxx>
spoke about *Re: [OM] the elusive f/2...* saying
> Perhaps there's two things going on here--a transmission index showing the
> amount of light that's really going throught the lens as measured by the TTL
> meter, and the aperture, which may be just a mathematical calculation of the
> size of the elements. I have some old Modern Photo tests and they do measure
> the aperture.
> 18/3.5 f/3.51
> 28/2.8 AF f/2.89
> 50/1.2 f/1.26
> 50/1.4 f/1.44
> 100/2 f/2.05
> 180/2 f/2.01
>
> Where does the lost light go? I have no idea but I guess into the internal
> baffles and flocking eventually to be lost as heat I suppose.
The motion picture industry measures the light going thru each lens
and rates the lens by "T/stop" or true f/stop. Most important for
zooms!
Tom
------------
Tom Trottier <TomATrottier@xxxxxxxx> ICQ: 57647974
Abacurial Information Technology Consulting
400 Slater St. Suite 415, Ottawa ON Canada K1R 7S7
__o +1 613 291-1168 fax:594-5412 (877)247-8796
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