> So, for a 50/1.8 lens, diameter of the glass is 28mm, so you could
> have a lump of muck 2.8mm wide stuck to the lens without it
> affecting image quality.
Yikes, that's a _lot_ of dirt. Anyone out there got an old 50/1.8 they want
to do some testing with? Presumably at the least, though, that's going to
reduce the incoming light by 1%, so everything'll get slightly dimmer --
pretty trivial change, though.
Perhaps it's just to avoid scratches which will reflect light into
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