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From: smh@mhuxl.UUCP (henning)
Newsgroups: net.rec.photo
Subject: Re: Flashes and telephoto lenses
Message-ID: <633@mhuxl.UUCP>
Date: Sun, 16-Mar-86 11:49:48 EST
Article-I.D.: mhuxl.633
Posted: Sun Mar 16 11:49:48 1986
Date-Received: Tue, 18-Mar-86 01:46:54 EST
References: <1587@watmath.UUCP> <263@noscvax.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
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From the keys of Steve Henning, AT&T Bell Labs, Reading, PA mhuxl!smh

In article <1587@watmath.UUCP>, rayazwinski@watmath.UUCP (Yazwinski) writes:
> I have heard that when using a flash and, say a 135mm lens you have to
> change your f-stop to allow for the light loss through the extra glass.
> I have also heard that f4.5 is f4.5 no matter which lens you use.

It is not amount of glass, but the number of interfaces that cause
light loss and flare in most lenses.  It turns out that the Minolta 135mm
lens has the least number of elements, 4, of any Minolta lens thus the least
loss.  The extreme wide angles have a large number of elements, 11
or 12 and the zoom lenses have the outlandish number of elements 14-16.
I do 100mm flash photography all the time and never have a problem.