DxOMark has tested the EF 17-40mm f/4L USM lens, the result of this lens is good, close to EF 16-35mm f/2.8L II USM lens.
Canon EF 17-40mm f/4L USM
Amazon Double Rebate: 17-40mm f/4L for $639, 135mm f/2L for $889
Amazon.com currently has deals on two L series lenses for sale.
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EF 14-24mm f/2.8L and more wide-angle lenses to be announced in Fall, 2013
In the second half of 2013, Canon will announce several new wide-angle zoom lenses include the long awaited Canon EF 14-24mm f/2.8L USM.
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