While they are hard to find, Sigma did make a 500/4.5 APO in the OM mount.
A very nice lens. About the same size as my Tamron 400/4, although the
Tamron is probably the better lens. Got mine in mint condition for about
$1600, which is very reasonable (but not quite a Doris) compared to the
prices of used Tamron 400/4's. I believe they sold new for about $3200 but
are now only available in AF versions as far as I know.
Steve Troy
>Date: Wed, 31 Jan 2001 18:12:47 EST
>From: Pandionhalietius@xxxxxxx
>Subject: Re: [OM] Philosophical / telephotical advice
>
>If sticking with Olympus the best long lens with outstanding quality
avaiable
>is a Tamron 400 mm f4. Add a converter and you have a very fine 560mm f5.6.
>This is a tad short for most birding and slow for slide work. With a tripod
>this comination is excellent and is not too heavy. A 600mm f4 or a 400mm
>f2.8 will stay at home alot more than a lens half its size. It is just a
>huge weight issue.
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