17-40mm f/4 vs 20mm f/2.8
I personally didn't like the 20 (sold) nearly as much as I like the 17-40. The 17-40 goes wider, has better snap (i.e., sharpness) and color (can be adjusted post-process). Also the flexibility of having an L zoom is nice. Then, the 17-40 is one stop slower too...never a problem for me though. Depends what you need. They're about the same size.
Sorry, no samples like you want.
PS - I also tried the Sigma 20 and didn't care for it either.
I was thinking of buying the 17-40mm f/4 lens, but want to know if
anyone compare it at 20mm with the Canon 20mm f2.8? I would be
interested to see both of them at 20mm f/4, f/5.6, f/8, and f/9.
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