Canon 17 40mm F 4 L

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Canon 17 40mm F 4 L. Canon EF series L USM Standard lens with an aperture of f4 is compatible with Canon Digital SLR cameras. So it is that the 17-40mm has a smaller maximum aperture than some cheaper.

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Other than the front element it is sealed against dust and water and features a diaphragm which remains nearly circular from f 4 to f 8. Small and lightweight for its class the EF 17-40mm f4L USM combines outstanding L-series build quality with an affordable price tag. Canons professional L series lenses promise only what they can truly deliver but what they deliver is truly excellent.

The 16-35mm f4L IS USM lens has 16 elements in 12 groups while the 17-40mm lens only has 12 elements in 9 groups.

This 17-40mm L lens is for full-frame film and 13x cameras like the 1D series. It contains 12 elements in 9 groups and features a focal length of 40 mm. The lens has an EF mount to work with the EOS line of cameras. 15 rows Spanning a versatile wide-angle range the EF 17-40mm f4L USM Lens is a Canon L-series zoom.