Pentax SMC-P A 15mm f/3.5

Manufacturer's Description:

"The PENTAX smc P-A 15mm F3.5 is a manual focus lens with automatic aperture control. It provides an extremely wide angle of coverage and features built-in filters. Like all PENTAX lenses, the smc P-A 15mm F3.5 wide-angle lens is treated with our acclaimed smc coating for maximum light transmission, sharp definition, and high contrast while minimizing flare and ghost imaging."