[rollei_list] couple of ignorant lens design questions.

this is a little off topic, but I know there are some knowledgeable lens
people in this forum.

#1  Why is it not possible to add coatings to your lens by adding a coated
filter?  Or why can't Rollei come out with a plain glass with HFT coatings
on it that you can put on your older lenses?  I know that at least some
filters are coated.  Does it have the affect of adding a coating to an
uncoated lens if you use one?   My guess is that you can't put mulitple
coatings on a single surface of glass so you have to coat multiple
elements with different coatings to get all the HFT.

Stupid question #2  Is contrast always good in lens performance?  Or is
there some way of designing shadow detail into a lens?  Or if one lens
gets better shadow detail than another lens of the same focal length and
speed and size then the one with more shadow detail is really just getting
a boost from flare.  And that extra shadow detail should always be of low
contrast.

Stupid question #3.  How much of the affect of super multiple coatings can
be duplicated by just using a good quality polarizing filter?

thanks.

Dennis
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