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    Pentax 560mm f5.6 announced

    To imagine the actual size and weight of this lens, I'll just take Canon's 400 f4DO for a rough comparision. The DO design is claimed to save weight and size on a conventional 400mm f4, yet it still weighs just below 2000grams, with the 1.4X, it will become a 560f5.6, and should reach the 2Kg...
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