Reviews and Problems with Canon EF 20-35mm f/3.5-4.5 USM
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Beware - Wrong Picture
29 June 2011
Summary: Beware - not the item pictured. Pictured is the L series lens, see the red ring? This lens is the much cheaper, consumer zoom lens, not a bad lens but certainly not at the level of the pictured item.
Conclusion: I bought this lens via ebay cheap for the rare occasions where 24 mm is not enough for me. So for a few pictures this lens is Ok, but on my 5D this lens is certainly no winner. It does his job and with some manipulation in ACR to remove the CA it is OK, but nothing more.
Pros: Lightweight, cheap
Cons: not sharp, not very solid construction, CA, Soft in the corners
Conclusion: Like many others I bought this to go with a 1.6x digital. Do not make this mistake! 20mm is not wide enough. The f/3.5-4.5 aperture forces the use of higher ISO. Since this lens is not very sharp at all, the added noise only worsens the softness. Stopping down helps but not much.