On Sat, Jan 09, 2010 at 09:40:15AM -0000, Bob W scripsit:
> > It seems that my PFA 50/1.4 is a lot more likely to fog over, 
> > especially when brought in from the cold, than any other lens I have.

My worst one for this is the FA100 macro; it's an aluminium brick, and
has a lot of thermal inertia.  I suspect traditional metal lens bodies
in general are worse than the polycarbonate ones.

-- Graydon

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