Super-telephoto lens: When mounted on a PENTAX K-mount digital camera body, this super-telephoto lens offers a focal length of approximately 859mm in the 35mm format.
High-grade multi-layer HD (High Definition) coating: Treated with the newly developed, high-grade multi-layer HD (High Definition) coating, offering higher light transmittance with reduced reflection to deliver sharp, clear images free of of flare and ghost images, even under demanding lighting conditions such as backlight.
Unique telescope-type optical design: and the use of two extra-low dispersion (ED) lens elements delivers bright, high-resolution images even at the edges, with minimal chromatic aberration.
Rounded diaphragm: This lens is designed with a rounded diaphragm to produce a smooth, beautiful bokeh, while minimizing the streaking effect of point light sources.
Smooth autofocus operation using an AF driving motor (DC motor) installed in the lens barrel.
Dustproof, weather-resistant construction featuring 29 special seals.
Built-in, removable C-PL circular polarizing filter holder in the lens barrel.
White lens exterior to minimize heat haze generated inside the lens barrel.