Industry expert Mason Resnick has this to say in his review:
"Featuring a revamped inner focusing system with a closer focus range, new lens coating to reduce flaring and ghosting, improved bokeh and a more advanced optical stabilizer, the new Canon EF 100-400mm f/4.5-5.6L IS II USM improves upon an already highly-regarded model."
Canon's new EF100-400 F4.5-5.6L IS II USM Lens is a compact, high-performance L-series lens.
Combined with a super-telephoto zoom, this lens is ideal for shooting subjects such as sports and wildlife. Using one fluorite and one super UD lens element, the new EF 100-400 lens provides excellent correction of chromatic aberration throughout the entire zoom range, helping to deliver high-quality images with high resolution and contrast.
Its rotation-type zoom ring allows for more precise composition and excellent balance when hand-held, and the improved zoom torque adjustment ring allows easy setting of zoom tension. Its inner focusing, ring USM, high-speed CPU and optimized AF algorithms offer fast and accurate autofocusing.
Three image stabilization modes (standard, panning, and during exposure only) provide outstanding results for a wide range of shooting situations. The lens' Optical Image Stabilizer provides up to four shutter speed steps of correction*, and the new Air Sphere Coating (ASC) helps to significantly reduce backlit flaring and ghosting.
Highly resistant to dust and water, and amazingly durable even when shooting in harsh conditions, the lens offers a fluorine coating on front and rear lens surfaces to help reduce smears and fingerprints.
The new lens hood features a side window that allows specialty filters to be adjusted with the hood in place. And a newly designed tripod mount can be attached or detached without removing the lens from the camera.
The Canon EF100-400 F4.5-5.6L IS II USM Lens has a nine-blade aperture for soft, beautiful backgrounds, and a minimum focusing distance of 3.2 ft./0.98 m with 0.31x maximum magnification.
Read more of Mason Resnick's review at the Adorama Learning Center online: http://www.adorama.com/alc/0014942/blogarticle/canon-ef-100-400mm-is-ii-usm-tele-zoom-lens-first-look.
* According to CIPA standards (400mm focal length, when using the EOS-1D X).
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