Two new EF lenses, expected in 2011, have been delayed. The lenses are the: - EF 500mm f/4L IS II USM - EF 600mm f/4L IS II USM Canon says that revised shipping dates will be made available as soon as possible. There is also no date for the availability of the new EF 200-400mm f/4L IS USM Extender l.4x lens. The EF 200-400mm f/4L IS USM Extender l.4x is being developed with an integrated extender that increases the maximum focal length to 560mm for sports and wildlife photography. High-quality images with high levels of resolution and contrast will be possible through the use of advanced optical materials such as fluorite crystal. The new lens will also include dust- and water-resistant construction designed for extended usage under harsh conditions. The EF 500mm f/4L IS II USM offers a lighter weight option for situations that require a long focal length. The optical formula of the new lens includes two fluorite lens elements for improved image quality and reduced chromatic a
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