Fast lens
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Such a fast lens as this 55mm F/1,4 lens is not the kind of lens you don't want to go for. Here, once mounted on a Pentax DSLR, thelens will become a 82mm, ideal for portraits as we often say that the best portrait focal lenngth is 85mm.
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SDM
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The SDM (ultrasonic) AF engine ensures discrete and fast autoficusing while the Aero Bright coating of the lens improves light reception and fights against all ghost images. It only measures 66mm long and weight 375 grams. Its diameter is 70mm.
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