Quote Originally Posted by buglinbilly
Loupey, thanks for taking the time to enlighen people like me. I had know Idea what an extension tube was.

I suppose this is for only marco shooting and can not be used on regular telephoto shots????

Can any tube be used with any lens, or are specific tubes made for or limited to specific lenses. For example can I use the same tube on my 70-300 lens and on my Marco 50mm lens?

Thanks again for the great post. BB
Any canon EF mount extension tubes will work with both of those. The only place you have to be careful is if you have some ef-s lenses, which some tubes don't support.