A beginner here trying to educate myself but I can't seem to figure this out. I understand about the circular polarizer being easier to use on a lens with a non-rotating front element. As I dream and drool over lenses I can't seem to figure out how to determine if the front element rotates or not. What magic lingo am I looking for that will give me that information? For example does the EF 70-300mm f/4-5.6 IS USM rotate or not? I know my 18-55 kit lens does but I can put it on the camera and see it turn. When I'm reading info about other lenses how can I tell? Sorry to ask such a beginner question but I'm googled until I'm worn out and I still don't know the answer. Thanks for your help, I'm loving this forum!