Specifications for smc P-DA 35mm F2.8 Macro Limited Lens Mount: PENTAX KAF2 Focal Length: 35mm (equivalent 53.5mm) Aperture: F2.8 Minimum Aperture: F22 Lens Construction: 9 elements in 8 groups Angle of View: 44 degrees (w/PENTAX DSLR) Minimum Focusing Distance: 0.456' (0.139m) Maximum Magnification: 1.00X Filter Diameter: 49mm Diaphragm Control: Fully Automatic Number of Aperture Blades: 9 Lens Aperture Ring: N/A Tripod Adapter: N/A Hood: Built-in, pull out type Objective Cap: Dedicated slip-on type Case: 48100 Z100 Max D x Min L: 2.5 x 1.8" (63.0 x 46.5mm) Weight (w/oHood): 7.6 oz. (215g) Notes: Quick-shift focus, SP (Super Protect) coating