I would suggest returning it and getting something else instead.
The Sigma 20mm f/1.8 is fast but its image quality wide open is
quite poor, plus it has a noisy slow focus motor. The Canon
EF20/2.8 is only about $30 more and is much better wide open.
Compared critically, the Canon lens hits its best stride
starting at f/4 and gets marginally better at f/5.6, the Sigma
doesn't get close to it until both are at f/5.6.
The 17-40/4L he already has is a better performer than the Sigma
at f/4, about the same as the Canon 20 at f/4.
Godfrey
--- Amita Guha <[EMAIL PROTECTED]> wrote:
> Today is Nate's birthday, and I got him the Sigma 20mm f/1.8
> because I
> thought he wanted it based on samples he'd seen. Turns out he
> likes it, but
> he has that range covered by his Canon 17-40mm, so he can't
> decide if he
> should keep it. The Sigma is faster than the Canon, but that's
> the only
> advantage as far as he can see. Does anyone have the Sigma
> 20mm or can
> anyone think of a reason for him to keep it? I don't mind if
> he returns it,
> but he is really on the fence about this one.
>
> Meanwhile, I'm eyeing this lens for myself...it's one of those
> times when I
> really wish we were on the same system...
>
> Amita
>
>
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