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Re: [APML]: "Special" Lenses

To: astro-photo@nightsky.com
Subject: Re: [APML]: "Special" Lenses
From: Michael Covington <mcovingt@aisun1.ai.uga.edu>
Date: Tue, 15 Oct 1996 11:25:00 -0400 (EDT)
In-Reply-To: <"<209663328116657C>209663328116657C@x-wb-0128-ms3.xerox"@-SMF-> from "Kocinski,Patricia M" at Oct 15, 96 06:46:14 am
Reply-To: astro-photo@nightsky.com
Sender: owner-astro-photo@nightsky.com


>       I have heard about "special lenses" which were designed for sports 
>  photography but work well with astrophotography. I believe the Cannon 
>  300mm f2.8 is one of these lenses. What is so "special" about them and 
>  why is that important? What are other "special lenses"? Thanks
> Patty
> Rochester, NY USA
> Patricia_Kocinski@wb.xerox.com

They are unusually fast for their focal length (most 300mm lenses are
f/4 or f/5.6).  They are also unusually expensive (like $3,000).


-- 
Michael A. Covington                http://www.ai.uga.edu/faculty/covington/
Artificial Intelligence Center                                           <><
The University of Georgia               Unless otherwise indicated, I am not
Athens, GA 30602-7415 U.S.A.         speaking officially for the University.

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