Pentax SMCP-DA* SDM Autofocus ED (IF) 300mm F/4 (K-Mount) LEN1226

Focal Length - 300mm (35mm Equivalent: 450mm) Maximum Aperture - f/4 Lens Mount - Pentax K Lens Format Coverage - APS-C Focus Type - Autofocus Image Stabilization - No Filter Size - 77 mm (Front)