Ask Rod – “Focus Ring?”

via email – Hi Rod,I’m new to DSLR photography and video.  I bought the 550D/T2i for its great capabilities for the price — and for its video capability.

I learned quickly that, while you can get amazing depth of view, it also requires a lot of manual focusing (something I’m still getting used to).  I’ve found it quite cumbersome to stay focused on subjects that are moving (like my 1 year old son). I noticed in some of your shots in your monopod/tripod post that you have some sort of extended ring around your lens.  What is that thing called?  Do you have any recommendations?  (I was looking at Do you have to get one specifically for each lens?  Are they expensive?  Does it make a big difference? Best Regards! -Jeff 

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