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Path: utzoo!watmath!rayazwinski
From: rayazwinski@watmath.UUCP (Rick Yazwinski)
Newsgroups: net.rec.photo
Subject: Flashes and telephoto lenses
Message-ID: <1587@watmath.UUCP>
Date: Mon, 10-Mar-86 13:50:29 EST
Article-I.D.: watmath.1587
Posted: Mon Mar 10 13:50:29 1986
Date-Received: Tue, 11-Mar-86 01:31:34 EST
Reply-To: rayazwinski@watmath.UUCP (Rick Yazwinski)
Distribution: net
Organization: U of Waterloo, Ontario
Lines: 9

I have read several different opinions on this subject and I was wondering
which was the truth.
I have heard that when using a flash and, say a 135mm lens you have to change
you 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.
PLEASE HELP!!!!!

		Rick...