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- SLR Lenses > Lens by brand > Pentax Lenses

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Pentax Lens 16-45mm f/4 ED AL DA Pentax SMC-ED DA 16-45 mm f/4-f/22 digital lens unit. Focal length range 16 - 45 mm Equiv. FOV (*ist D) 24 - 68 mm Maximum aperture F4 constant Minimum aperture F22 Construction 13 elements in 10 groups Minimum focus distance 0.28 m (0.92 ft) Maximum magnification 0.26x Filter diameter 67 mm Dimensions (dia x len) 72 x 92 mm (2.8 x 3.6 in) Weight (no hood) 365 g (12.9 oz)             Filters: UV Filter (67mm) Circular Polarising Filter (67mm) The compact, high-performance, interchangeable SMC Pentax DA 16mm-45mm f/4 ED AL lens features a three-times zoom ratio with focal lengths covering ultra-wide to moderate-telephoto ranges for the angle of view equivalent to 24.5mm-69mm in the 35mm format. The DA-Series Lens lens features a responsive Quick-Shift Focus System that allows photographers to instantly switch the focus mode from auto to manual with a slight twist of the focus ring. Coupled with a simple, functional design and the elimination of an aperture ring, this new mechanism considerably improves the camera's operability. The lens also incorporates an Extra-low Dispersion (ED) glass lens element and two aspherical lens elements for true-to-life image reproduction and overall size reduction. The image circle in DA-series lenses, including the SMC Pentax DA 16mm-45mm f/4 ED AL, is designed to perfectly match the 23.5mm x 15.7mm size of the CCD used in Pentax digital SLRs, optimizing camera performance. The new design also contributes to a drastic reduction in size, weight and production cost, compared to 35mm-format counterparts with similar specifications.