Quote Originally Posted by BuddhaBelly View Post
Thanks all of you - really helpful.

(yes it's only 5 or so years old i think)
In which case, just use standard (read: GENTLE) lens cleaning practice.

The fragile coatings are usually found only on the very first coated lenses, say from about 1940~ to the very early 50s. They're not often found, and not all early coatings were/are fragile.