I think the reason for the Sigma's existence is that your substitutes
aren't really substitutes. None of your choices are zooms and your
500mm end is only f/4. The only other 500mm f/2.8 optic I can find is
this and it's not a zoom either (amongst other more serious things):
<http://www.takahashiamerica.com/catalog/product_info.php?products_id=181>
Granted, you gotta really want a 200-500/2.8 to be willing to pay the
freight but I'm sure there are a few buyers out there. But it's only
available in Canon, Nikon and Sigma autofocus mounts. You don't need to
worry about fitting it to your OM-1. :-)
Chuck Norcutt
Dawid Loubser wrote:
> I remember being shocked at the size and (to be frank) ugliness
> when the (admittedly amazing feat of gung-ho-ness)
> Sigma 200-500/2.8 was announced. And that was when it was in black!
>
> When production units started showing up in Army green... ugh.
> Over at the Open Photography Forums at that time we had a discussion
> of when one would want to use this beast.
>
> When is it worthwhile carrying a 35-pound monster around, versus just,
> say, a Canon 200/2.8 (and there is no way I will ever believe a Sigma
> zoom
> is better than the 200/2.8L) and a Canon 400/2.8L or 500/4.0L. The two-
> lens kit
> is much, much smaller (hand-holdable) and either just a bit slower (f/
> 4)
> or a bit shorter (400mm) at the long end.
>
> I am not saying this monster Sigma has no reason for existence, but
> wow -
> at the size/cost! In fact, one could buy 200, 300, 400, 500 primes for
> pretty much the same price, each being smaller and (I have to believe)
> better.
>
> Now the kicker - will they make the 200-500/2.8 in OM mount, so I can
> stick my tiny OM-1n on the back of it? :-)
>
> On 21 Apr 2009, at 4:40 PM, John Hermanson wrote:
>
>> That is a monster. Looks like something GI Joe would use.
>
--
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