In a message dated 4/17/2007 4:13:30 P.M.  Pacific Daylight Time, 
[EMAIL PROTECTED] writes:
Generally the dust only  settles in the cavity where t4eh aperture
resides so it's not a particularly  complex procedure but it's labor
intensive. So unless the dust cover is  particularly dense and the lens
is well used or valuable then it's probably  not worth the effort. If
it's bad enough it can reduce the contrast as can  vapor deposits from
old lubricants or plasticizers but it's pretty rare to  come across a
lens that bad.

Cheers,

-- 
Rob  Studdert

=========
Question -- Dust in a lens does NOT show up like  dust on a sensor? Hmmm. I 
thought that's why people got all hung up on dust in  lenses. 

Marnie aka Doe  




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