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Extra-low dispersion (ED) glass is used for thoroughly eliminating the chromatic aberration that tends to occur in super telephoto lenses. This enables a sharp resolution with a minimum of color blurring. Various types of protective coatings, prevention of reflections on the inner side of lens, and a large hood are used for rendering results with a transparency and reduced ghosting and flare.
The smc FA 645 400mm f/5.6 ED IF Lens from Pentax is a medium format, manual and autofocusing telephoto lens with a 35mm-equivalent focal length of 315mm. Extra-low dispersion (ED) glass is used to eliminate chromatic aberration for improved sharpness and contrast. Multi-coatings offer protection and prevent reflections on the inside of the lens to minimize ghosting and flare. Also helping to prevent flare is the supplied large lens hood. Quick AF/MF switching is also possible, and an internal focusing system enables easy MF operation and improves focusing speed while minimizing lens extension, allowing for a closer minimum focus distance. Additionally, the lens features a rotating tripod collar with clip to enable speedy switching between vertical and horizontal orientations.
Focal length (Equivalent to 35mm format)
Angle of View
7 elements / 6 groups
No. of diaphragm blades
Closest focusing distance
Maximum reproduction ratio
Diameter x length
83 x 252 mm
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C.R. Kennedy is Australia’s leading importer and distributor of photographic equipment. Our head office and main warehouse is located in Melbourne with branch offices and warehouses in Adelaide, Brisbane, Cairns, Perth and Sydney.
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