Neutrino coating for minimum ghosting, CA and flare</br>Features built-in chip for auto metering with Pentax DSLR cameras</br>Lightweight ABS construction</br>Ergonomic focus ring</br>Innovative focus lock</br></br>Product Description</br></br><b>Irix Firefly 15mm Ultra Wide Angle Lens for Pentax</b> <br><br> <b>Magazine reviews:</b><br> <br> <b>Digital Camera World - 5 Stars "Great Value"</b> <br><br> "The Irix 15mm combines impressive handling and build quality with superb image quality, at a bargain price." <br><br> <b>ePHOTOzine</b> " <br><br> The Irix 15mm f/2.4 lens is a powerful photographic tool. This new lens from Irix lifts the performance for such lenses way beyond the first early 1970s offerings and gives us a lens that is free from flare, and very sharp. This Swiss design is an excellent one, built in Korea to very high standards." <br> <br><b>DigitalRev</b> <br><br> "I was incredibly surprised at the quality of the Irix and can easily say it is an excellent lens. Both of the "Firefly" and "Blackstone" versions are optically and mechanically sound. Their sharpness is fantastic, with distortion and vignetting very well controlled. There are no problems with chromatic aberration, and ghosting and flare are are kept in check. I really hope that TH-Swiss produce more lenses like this in future. The Irix 15mm f2.4 is produced for Canon EF, Nikon F and Pentax K mount." <br><br> <b>Product features:</b> <br><br> <ul> <li>Neutrino coating for minimal ghosting, chromatic aberration and flare, with maximum sharpness and contrast</li> <li>15 elements in 11 groups for extremely high image quality</li> <li>Focus lock allowing you to lock the chosen setting at any time</li> <li>Weather sealed construction resists the elements for use in the harshest conditions</li> <li>Hyperfocal distance scale for precise information about depth of field</li> <li>Clearly-labeled infinity position for the focus ring with a noticeable "click" to make it easy to find, even in the dark</li> <li>Minimum focus distance of 11.02" (0.28m)</li> <li>Ergonomic focus ring for faster focus</li> <li>9 rounded diaphragm blades for a beautiful bokeh effect</li> </ul></br><br/>http://www.amazon.com/gp/product/B01GEBLQK6