Lens Mount: - PENTAX KAF2 Focal Length: - 55-300mm (equiv 84.5-460mm) Aperture: - f/4-5.8 Min Aperture: - f/22-32 Lens construction: - 12 elements in 8 groups Angle of view: - 29.0-5.4° (w/ Pentax DSLR) Minimum focusing distance: - 4.6’ (1.4m) Filter Diameter: - 58mm Maximum magnification: - 0.28x Diaphragm control: - Fully Automatic Number of aperture blades: - 6 Lens Aperture Ring: - n/a Tripod Adapter: - n/a Hood: - PH-RBG 58mm Objective Cap : - O-LC58 Case: - S80-160 Max Diameter x Min Length : - 2.8 x 4.4” (71.0 x 111.5mm) Weight (w/o hood): - 15.5 oz (440g)