The 17-55 IS shows slight sharpness improvement at f/4, but performance at f/2.8 is very good. My Canon EF 16-35mm f/2.8L USM Lens is slightly sharper in the center at 17mm wide open, but the 17-55 IS is sharper at all other tested focal lengths - and proved much sharper in the corners at all focal lengths and apertures. Distortion was also

Verdict. Ce nouveau zoom grand-angle Canon EF 16-35 mm f/4 L IS USM fera le bonheur des amateurs de photos de paysage ou de reportage. Son ouverture de f/4 constante lui permet d'être utilisé de
The 24-70mm features Canon's standard EF lens mount, and will work on all its digital SLRs regardless of sensor size. A rubber 'O'-ring around the mount helps prevent dust or moisture from getting into the camera. The filter thread is 82mm, larger than the previous version's 77mm, but the same size as used by the EF 16-35mm f/2.8L II USM.
The RF 15-35mm f/2.8L IS USM’s broad zoom ring has a step-up in size roughly at its mid-point, which makes it easy to identify and differentiate from the manual focus ring that is further forward. Both have a smooth, easy action. At the far end, close to the front element, the Canon RF 15-35mm f/2.8L IS USM has a dedicated control ring.
Attached to the APS-C sensored EOS 7D, the EF300mm f/2.8L IS USM once again puts in a strong performance, scoring a DxOMark score of 17, relative to the EOS 7D’s resolution of 18megapixels. Equally, the Pentax lens scores very well, managing 15 compared to the 16.3megapixels available on the K-5.

Measuring 3.3" x 4.1" (83.5 x 103mm) (DxL) and weighing 1.3lb (600g), the Canon EF 16-35mm f/2.8L USM Lens is relatively small and light . Build quality is very high - indicative of its Canon L Series heritage. This is a very nice handling and carrying lens. It is easy to take this lens with you - mounted or in a case.

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    • canon ef 16 35mm f 2.8 l ii usm test