Yes - for current coated & multicoated lenses it usually is marginal - 33% (!)
difference is the smallest that the film is able to record. With your dad�s old lenses
you have to do like the photographers of old: test.
All the best!
Raimo
Personal photography homepage at http://personal.inet.fi/private/raimo.korhonen
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P�iv�: 24. syyskuuta 2001 19:58
Aihe: Re: lens brightness
>OK folks, I hear what you are saying.
>
>Now, tell me how interchangeable lenses are used along with those fancy hand held
>light meters. When you take out your Pentax Spot Meter, do you adjust it every time
>you put a different lens on the camera? Oh, the T-value for that lens is 1/2 stop
>better than this one?
>(I'm serious here, not pulling your leg!)
>
>If I take out my Dad's old 2x3 Speed Graphic and the GE meter hand held lightmeter,
>it says shoot at this f stop/speed. It doesn't say much about T-values for the lens.
> Is the difference that marginal that it doesn't matter?
>
>Regards, Bob S.
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