Archived posting to the Leica Users Group, 2001/01/08

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Subject: Re: [Leica] Leica R 24mm f2.8 & 180mm f4 questions
From: Martin Howard <howard.390@osu.edu>
Date: Mon, 08 Jan 2001 13:54:59 -0500

Jem Kime jotted down the following:

> As the film industry noted many years ago, F stops are only theoretical values
> of light transmission not the true values actually obtained. For this reason
> the professional cine industry works to T stops, (standing for True). I was
> often told in my youth by my father that a Leitz lens of F2.8 would equal a
> lesser lens of F2, at that time I didn't understand but can appreciate what he
> was trying to say now.

Then how come incident light meters work with Leica cameras and do not
result in overexposure?

M.

- -- 
Martin Howard                     |
Visiting Scholar, CSEL, OSU       |              Shit happens.
email: howard.390@osu.edu         |
www: http://mvhoward.i.am/        +---------------------------------------