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http://www.bhphotovideo.com/indepth...-canon-ef-200-400mm-f4l-usm-extender-14x-lens
Hands-On Review: the New Canon EF 200-400mm f/4L IS USM Extender 1.4x Lens
By Bjorn Petersen
Published: Tuesday, May 14, 2013 - 12:00am
Canon has just announced a new telephoto-zoom lens that covers a range of oft-used longer focal lengths and brings with it the quality and usability of their L series lenses: the EF 200-400mm f/4L IS USM Extender 1.4x lens. This lens takes the new top spot as the longest zoom lens for EOS cameras and incorporates a constant f/4.0 maximum aperture to provide consistent imaging performance throughout the range of focal lengths. Additionally, a 1.4x teleconverter is integrated into the lens’s design to provide an effective maximum focal length of 560mm. The efficiency of the zoom lens profile coupled with an internal teleconverter is further benefitted by the enhanced optical construction—including a fluorite glass element—as part of the L series of professional-grade lenses.
Hands-On Review: the New Canon EF 200-400mm f/4L IS USM Extender 1.4x Lens
By Bjorn Petersen
Published: Tuesday, May 14, 2013 - 12:00am
Canon has just announced a new telephoto-zoom lens that covers a range of oft-used longer focal lengths and brings with it the quality and usability of their L series lenses: the EF 200-400mm f/4L IS USM Extender 1.4x lens. This lens takes the new top spot as the longest zoom lens for EOS cameras and incorporates a constant f/4.0 maximum aperture to provide consistent imaging performance throughout the range of focal lengths. Additionally, a 1.4x teleconverter is integrated into the lens’s design to provide an effective maximum focal length of 560mm. The efficiency of the zoom lens profile coupled with an internal teleconverter is further benefitted by the enhanced optical construction—including a fluorite glass element—as part of the L series of professional-grade lenses.
