Thanks for all the reply!
Oops. I was referring to EF-S17-55mm f/2.8 IS USM & EF17-40mm f/4L USM.
I have a EF50mm f/1.4 USM. It is a GREAT lens. I like the pictures taken with it. But I do have problem with indoor taking a group of children, it is not wide enough to accommodate everyone within the frame.
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