Pentax 300mm f/4 SMC DA* ED IF SDM Pentax Lenses (K mount) 21760. The SMC Pentax-DA* 300mm F4 ED [IF] SDM is a prime telephoto lens with a fast, quiet autofocus drive, bright aperture, compact design and multiple coatings for excellent sports and wildlife results.. Pentax. 21760. 027075141261
