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- SLR Lenses > Lens by brand > Pentax Lenses

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Pentax Lens 21mm f/3.2 AL DA Lens Mount:: PENTAX KAF mount Lens Construction:: 8 elements in 5 groups Angle of View:: 68 degrees (when used with *istD series & K100D body) Aperture Control:: Automatic Number of Diaphragm Blades:: 7 Minimum Aperture:: F22 Metering System:: TTL open-aperture metering Minimum Focusing Distance:: 0.66 ft. (0.2m) Filter Size:: 43mm or 49mm Maximum Magnification:: 0.17X Dimensions:: 2.5" x 1.0" (63mm x 25mm) Weight:: 4.9 oz. (140g) without hood; 5.5 oz. (155g) with hood   The DA 21mm incorporates a hybrid aspherical lens in its eighth optical element to effectively compensate for a variety of aberrations, which cause adverse effects on overall image quality. In order to assure high-quality image reproduction over the entire focusing range, it also features a floating mechanism, which is designed to adjust the degree of aberration compensation in relation to the focusing distance.