Celestron is also good.
Also, f/stop with mirrors is effectively 1 stop less because of the
central mirror obstruction.
Tom
On Sunday, September 23, 2001 at 13:46, Craig Cunningham
<olympus@xxxxxxxxxxxxxxx>
wrote on "Re: [[OM] (Fwd) Using non-zuiko lenses with OM's]," saying..
> Richard,
>
> I'm not personally familiar with the Samyang brand (I do own a 19-35mm Phoenix
> zoom though, it's ok...), but I've read from a number of members here and
> people on www.photo.net that dealing with Cameta Camera is pretty risky at
> best.
>
> Also keep in mind that the catadioptric (mirror) lenses can have lower
> contrast and under certain circumstances product "donut hole" artifacts on
> your photos.
>
> I've got a Tamron 500mm f/8, and I'd rate it a C+ to B overall. It IS
> portable, and affordable as well.
>
> Check out http://www.keh.com and check Tamron Adaptall Lenses under their Used
> Equipment. I bought mine there; it was graded Excellent, which was
> conservative and I think that you should be able to find a Tamron or Vivitar
> Series I for under $200 if your budget is limited.
>
> Craig
>
> From: rmaust@xxxxxxxxxxxxxx
> Received: from default (user-vcauviq.dsl.mindspring.com [216.175.126.90])
> by barry.mail.mindspring.net (8.9.3/8.8.5) with SMTP id RAA18251
> for <olympus@xxxxxxxxxxxxxxx>; Sat, 22 Sep 2001 17:04:03 -0400 (EDT)
> Message-ID: <004a01c143a7$f553e500$77b7fea9@default>
> To: <olympus@xxxxxxxxxxxxxxx>
> References: <20010922012516.27282.qmail@xxxxxxxxxxxxxxx>
> Subject: Using non-zuiko lenses with OM's
> Date: Sat, 22 Sep 2001 13:48:32 -0700
>
>
> Hi there,
>
> My first post, I su*bscribe to the digest, so hope this is going to the
> right place...
>
> I've only used Zuiko lenses with my OM's but, given that the longer focal
> length Zuiko's are expensive and/or heavy, I've been wondering about
> off-brand lenses. The 500mm Zuiko Reflex lens looks great, but I've never
> come across one and imagine they'd be pretty expensive if I did find one.
> There are a couple of 500mm which keep coming up on e*ay that are pretty
> cheap, one of which weighs only 12.7oz and is 3x3.4 inches:
>
> http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1277390137
> http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1277390669
>
> Since you pay for what you get, I'm assuming that they're not great lenses,
> but wondered if anyone had tried them or had any recommendations?
>
> Thanks,
>
> Richard
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