Hello everyone,


What is the protectivefrontelementon this lens? Is it just a regular white glass? Does it act like a filter? In the review of this lens, Bryan said that this front element can be replaced easily and inexpensively should something happened. I know technically any lens' front element can be replaced, but why are only supertelephos and the 300 f/4L IS have these protective front elements.By the way, today I tried to clean my 1-week old 500 f/4L IS' front element and found out that it was much tougher and stickier to do theusual circular mothion as though this front element is not made of smooth glass comparing to my other lenses.


Thanks for the replies.


Nate