The Pentax 21987 is a 35 mm f/2.4 lens and packed with features that take your camera’s performance to the next level. Designed specifically for Pentax DSLR cameras, this Pentax 21987 is lightweight and compact making it easy to carry around. This Pentax lens features the Pentax Super Protect (SP) coating that protects this lens from damage by dust, water, and grease. The Pentax 21987 has a maximum apertureof 2.4 which is fast and capable of delivering high-resolution images. This Pentax lens has an aspherical lens that reduces the effect of spherical aberration.