The Canon 40mm f2.8 lens sits in a sweet spot between Canon's 50mm f1.8 and 50mm f1.4 lens offerings. At f2.8 it probably wouldn't be my first choice for low light shooting, but it's compact size and focusing distance of .98 feet makes it a very interesting travel lens.*
Sharpness on the Canon 40mm f2.8 lens is very good wide open (even in the corners), but the Lens does have strong vignetting wide open on a full frame body. On a crop sensor body like the Canon t2i, vignetting is much less noticeable overall and disappears completely by about f3.5.*
Canon has gone out of their way to say that the new STM motor is very quiet and optimized for video users. However, in testing it seemed as though the STM system was much louder then the USM motor used on Canon's L series lenses. Focusing speeds of this new motor type were decent, but noticeably slower then L series glass.*
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