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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