A couple of incidental notes:

Scratches on the front element of a lens have *very* little effect on
image quality  (unless there are so many of them that veiling flare
starts to reach intolerable levels). Scratches on the *rear* element
of a lens are much more dangerous. Protect that rear element at all
costs when swapping lenses!

For those who wondered why my friend photographs under UV light at
all, he's a forensic pathologist: he says UV is really good for
revealing bite marks. I'll just take him at his word for that... But
he's a very good photographer outside the morgue and has won prizes
for his landscapes in juried competitions.
 
-- 
Mark Roberts - Photography & Multimedia
www.robertstech.com





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