In article <33cbd781.1188027@news.redestb.es>, fmg1@mx2.redestb.es says...
[...]
>Your TTL system will compensate for everything you put in your lens.
[...]

As I pointed out earlier in this thread (with a method for checking
it for yourself...), this is often not true with colored filters for
B&W films...
Hope This Helps
(David Ruether - http://www.fcinet.com/ruether )