The Pentax SMC P-DA 40mm f/2.8 Limited lens is designed to be used specifically with digital SLR cameras. The focal length is equivalent to 60mm in 35mm format. It's ultra-compact "pancake-type" design makes it possible to make a lens that only weighs 3.2 ounces.
Like all Pentax lenses, this lens is treated with Super Protect/SP coating for maximum light transmission, sharp definition, and high contrast images. The advanced optical design used for this lens provides exceptionally high resolution optics with minimal aberrations.
DA series is specifically designed for digital cameras