CPN Articles for EF 100-400mm f/4.5-5.6L IS II USM Lens

Canon Professional Network has posted two articles about the new EF 100-400mm f/4.5-5.6L IS II USM supertele zoom lens that is ideally suited for sports and wildlife photography.

The EF 100-400mm f/4.5-5.6L IS II USM lens features Canon L-series weather resistance and rugged magnesium housing. Wildlife photographer and Canon Explorer Danny Green shares his thoughts and experience with the new EF 100-400mm f/4.5-5.6L IS II lens. The second article is another technical introduction of the lens.

The lens features 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 lens improves upon an already highly-regarded model. See more at the official announcement page.

New Articles for EF 100-400mm f/4.5-5.6L IS II USM Lens

From CPN article :

“This EF100-400mm f/4.5-5.6L IS II USM lens has the new, special Air Sphere Coating (ASC) technology that incorporate what Canon calls a low refractive index layer. It took me a while to get my head around this, but it’s fascinating. Basically, when light enters a lens, it slows down as it passes from the air through the glass. This slowing down in speed is what causes reflections and flare, causing problems such as ghosting and contrast degradation.”

From the technical introduction of the lens :

“The new Air Sphere Coating has been developed by Canon to minimise reflections and flare. It consists of tiny nano particles of air trapped in a film above the conventional multi-layer coatings. These Air Sphere particles form a super low reflective coating on the surface of the lens element to reduce reflection and act as a ‘crash mat’ to reduce the speed that light travels through the layer so there is not such a large change in speed when the light enters through the glass of the lens element. The major cause of reflections is the sudden change in the speed of light as it passes from air to glass, and this new technology prevents the cause of visible ghosting and flare.”

Canon EF 100-400mm f/4.5-5.6L IS II USM Lens Price

The EF 100-400mm f/4.5-5.6L IS II USM will be available in December 2014 for USD $2,199.