Not sure what you mean by "least" amount of glass. Other things being equal
the faster the lens is the more glass it will have in order to allow more
light to get in. There's no reason the 40mm f2 could not be an f1.2, though
with cost in terms of its size and weight--if that lens were an f1.2 it
would come to us looking an awful lot like the 50/2.
Tris
At 09:18 AM 7/31/01 -0600, you wrote:
Just been looking at pages listing all the lenses I'd like, and I noticed
that the brightness seems to peak at 50mm.
I can understand why it'll fade off as the lens gets longer, because
there's more glass there -- but why isn't the 16mm f0.6? Is it some sort of
coincidence that 50mm happens to match up with the least amount of glass and
that's why it's the "standard" lens?
-- dan
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