I use this lens mostly for existing light interior photos and portrait photos. (It does work well with strobes in a studio setting too.)

Between the fast, constant aperture and the IS system, you get great low-light capability.

It’s as sharp as my 50 1.4 but more versatile for use in group portraits.

It appears to be at least as well-built as the 40D/30D I use it with.

It is expensive, but it is really the best thing you can hang on a Canon crop frame camera. If you intend to go to a full frame format at some point then this will not be the lens for you and you should look into the 24-70mm L lens.

Pros: Smooth bokeh, Fast, Sharp, Versatile

Cons: fairly large & heavy (but not as heavy as the 24-70), Hood has to be purchased seperately

Best Uses: Portraits, Night/Low Light Photography, Travel Photography

To get your copy click here Canon EF-S 17-55mm f/2.8 IS USM Lens for Canon DSLR Cameras