The Pentax 40mm f/2.8 DA Ultra-thin lens for PENTAX digital SLRs is designed for exclusive use with PENTAX digital SLR cameras, this unique pancake style standard lens measures a mere .59 inches in length and weighs just 3.17 ounces. Combined with the popular PENTAX *ist DS digital SLR, the PENTAX DA 40mm F2.8 Limited lens will offer the smallest and lightest digital SLR combination available from any manufacturer.
PENTAX KAF mount
Equivalent focal length to 60mm in the 35mm format with *ist D/DS
The image circle is designed to match the CCD used in PENTAX digital SLRs
Ultra-compact pancake-type design weighs just 3.2 ounces
Exceptional high contrast, high resolution optics with minimal aberrations
Responsive "Quick-shift Focus System" allows instant shift from AF to MF
Comes with a lens hood to minimize flare and ghost images