The Pentax SMC DA 40mm f/2.8 Limited is an ultra-compact pancake lens designed specifically for Pentax APS-C DSLRs.
As one of Pentax’s Limited-series lenses, it features a high quality metal build with distance scale. It offers users a 60mm focal length after sensor crop factor. Pentax included an advanced optical design which provides high contrast images with minimal optical aberrations. It features a Quick-Shift Focus System, more commonly referred to as full-time manual focusing.