> A system with the largest =A0possible aperture as a starting point is,
> all else being equal (which it never is), liable to be superior to one
> with smaller maximum aperture. A system which does not have constant
> aperture across the range - eg f 1:2.8 all the way, almost always
> indicates that a compromise has been used between performance and
> cost. The "Gold Standard" is constant aperture across zoom range and
> this is what you get in most top zoom lenses. If you don't it's
> usually because they are 'pushing the envelope" =A0in some other area.
> [[I own NO 35mm zoom lenses with constant aperture. The closest I have
> is a superb Minolta 17-35mm f2.8-f3.5. This is such a limited range
> lens that it is about the only one that Sony decided not to build when
> they took over Minolta's camera division. Probably the best lens I
> own. ]]

I think, I've got the point. Thanks.

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