In a message dated 11/28/99 8:27:33 AM Eastern Standard Time,
fgernens@xxxxxxxxxxxxxxx writes:
> Roger Scully wrote
>
> > If the coating really makes a
> > difference, it is only in a very limited way and probably only if the
> > photographer does not properly shield the lens from direct sunlight.
>
> It does make a difference, and here's why. I'll start with some figures
> from Robert Monaghan's web site http://www.smu.edu/~rmonagha/mf.
> He has a table
>
> uncoated SC MC
>
> glass-air surface 93
> % 99.8%
> 50 1.4 7 elt 41.8
> % 97.6%
> 14 elt zoom 17.5
> % 95.3%
>
> I don't know how he arrived at these figures, but suppose for
> the moment that each element has the equivalent of 1 air-glass
> surface and you get:
>
AMEN!
Roger Skully
robinsnestphotography.com
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