The same system or not is not important, again it is the focal length,
aperture and sensor coverage count. Isn't the DZ 25/2.8 is only 90g? So the
increase in focal length doesn't necessary increase the weight.
C.H.Ling
----- Original Message -----
From: "Leandro DUTRA" <leandro.gfc.dutra@xxxxxxxxx>
>
> 2008/3/5, C.H.Ling <ch_photo@xxxxxxxxxxxxx>:
>>
>> You cut too much of the original message, Bernard was talking about
>> 17/2.8.
>> Based on your therorey, a 17/2.8 should be samller than a 10.5mm F2.8,
>> right?
>
> No, in the same system it will be bigger, obviously -- the mm there
> are a measure of focal length, thus size. But it might be wider, or
> become wider in order to become faster, but I don't know by how much.
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