[pure-silver] Lens quality, filter degradation

Hi all,

        Recently on a photo website, likely APUG or photo.net - I don't recall =
which, a poster made the declaration that placing filters on a 'high =
quality' lens (in this case the reference was Rolleiflex Planars and =
Xenotars) degraded the optics to the level of the filter, and thereby =
nullifying the need for a 'quality' lens.  The last point is clearly an =
overstatement, esp. considering the source, but I was curious as to what =
the actual facts might be.  It seems there may be several factors to =
consider, such as coatings and glass quality, but are there other =
considerations, and what degree of impact might they have?  As for =
myself, I always use a lens hood when possible and more often than not a =
yellow Hoya multi-coated filter when shooting.  Thanks,

Scott
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