I have a 600 F4 non/IS lens with the glass drop-in filter.
I was wondering if the glass is necessary?
The reason I ask is, I'm from the side that doesn't believe in putting
an extra layer of glass (ie a UV filter) on my other L glass.
So what's the purpose of just having a glass filter in that slot? Obviously
its not to protect the lens. If I remove it and just leave the holder in
do I risk any foreign objects getting down inside the barrel and screwing
things up down the road?
Anyone have any thoughts on this?
Thanks
Doug