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17-40 f4L on 550d upgrade from the kit lens

Started Oct 20, 2013 | User reviews thread
arty H Senior Member • Posts: 1,546
Re: 17-40 f4L on 550d upgrade from the kit lens

I use the 17-40 on crop and full frame. Mine is sharp across the frame on crop, and sharp across the frame on full frame, especially when stopped down. I am surprised at the comment that the lens isn't sharp stopped down. I have used mine at a variety of apertures and it is sharp.

Of course, I avoid very small apertures, when I can. I try to keep F stops at F8 or wider on crop, and F11 or so on full frame. This helps to avoid the effects of diffraction. However, I have never noticed problems with sharpness in good light on crop. Contrast is much better than the 18-55IS.

The lens has different uses on crop and full frame, but it is moderate in size and weight for a full frame zoom lens.

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