Irix Firefly 15mm f/2.4-22 Ultra Wide Angle Lens with Built-in Chip for Pentax EF Digital SLR Neutrino coating for minimum ghosting, CA and flare Features built-in chip for auto metering with Pentax DSLR cameras Lightweight ABS construction Ergonomic focus ring Innovative focus lock Neutrino coating for minimal ghosting, chromatic aberration and flare, with maximum sharpness and contrast 15 elements in 11 groups for extremely high image quality <span class="a-text-bold">Focus lock </span>allowing you to lock the chosen setting at any time Weather sealed construction resists the elements for use in the harshest conditions <span class="a-text-bold">Hyperfocal distance scale</span> for precise information about depth of field <span class="a-text-bold">Clearly-labeled infinity position </span>for the focus ring with a noticeable &#034;click&#034; to make it easy to find, even in the dark Minimum focus distance of 11.02&#034; (0.28m) <span class="a-text-bold">Ergonomic focus ring</span> for faster focus 9 rounded diaphragm blades for a beautiful bokeh effect Weather sealed, usable even in extreme weather conditions Inner seals also protect from accidental liquid splashes or spills Perfect for photographers who need to work in all kinds of weather, <span class="a-text-bold">rain or shine</span>