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Re: What, no ideas?

  • From: eml@xxxxxxxxx
  • Subject: Re: What, no ideas?
  • Date: Mon, 27 Jan 1997 16:26:54 -0500 (EST)
Just a quick thought.  If you are using a lens with a large number of
glass-air boundaries. as for example a zoom or a very fast lens,
it is possible to see flare far more quickly than in a simple
but well corrected lens like, for example, a Tessar.

Because you are operating at or outside the extreme limits of the 
coatings' design range, they often become ineffective, and no
better or even worse than a single coating.  I have found my single
coated Tessars and Xenars to be quite flare-free, but I would really
wonder about a lens with 6 or 8 internal glass-air surfaces or more.

-- 
    _/_/_/_/ _/_/    _/ _/   | Edward M. Lukacs 
   _/       _/ _/ _/_/ _/    | eml@xxxxxxxxx 
  _/_/_/   _/  _/  _/ _/     | 3850 Tunlaw Road, NW, Apt. 815 
 _/       _/      _/ _/      | Washington, DC 20007
_/_/_/_/ _/      _/ _/_/_/_/ | Telephone: 202-338-1489


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