The ZD 50-200 is 2.8 to 3.5, Chuck
Chris
On 25 Aug 2006, at 11:43, Chuck Norcutt wrote:
> One thing to note on the Sigma is that it is not a constant aperture
> lens like the ZD. The ZD has a maximum aperture of f/2.8
> regardless of
> the focal length setting. The Sigma starts out at f/4 at the 55mm end
> but closes down further to f/5.6 at the 200mm end. The maximum
> aperture
> at intermediate focal lengths is somewhere between f/4 and f/5.6.
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