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Posting-Version: version B 2.10.2 9/5/84; site genat.UUCP
Path: utzoo!utcs!mnetor!genat!jorge
From: jorge@genat.UUCP (Jorge Olenewa)
Newsgroups: net.rec.photo
Subject: Re: Flashes and telephoto lenses
Message-ID: <2579@genat.UUCP>
Date: Tue, 11-Mar-86 10:36:58 EST
Article-I.D.: genat.2579
Posted: Tue Mar 11 10:36:58 1986
Date-Received: Wed, 12-Mar-86 08:44:26 EST
References: <1587@watmath.UUCP>
Reply-To: jorge@genat.UUCP (Jorge Olenewa)
Distribution: net
Organization: Genamation Inc. (Toronto Ontario, Canada)
Lines: 26
Summary: 

In article <1587@watmath.UUCP> rayazwinski@watmath.UUCP (Rick Yazwinski) writes:
>I have read several different opinions on this subject and I was wondering
>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...


In order to set the record perfectly straight, the answer to this
question might entail a rather long dissertation.

For short, the latter statement is correct in all cases (the assumption
is that you are following the indications of your flash calculator and
that you DO NOT HAVE A FILTER ON THE LENS).

In order to understand this better, consult the Photo books in your local
library and/or photo retailer under "Flash".

Cheers,

Jorge L. Olenewa
Genamation Inc.
351 Steelcase Rd. West
Markham, Ontario   L3R 3W1
(416) 475-9434