"The rectalinear Full Frame super-wide angle lens with an angle of view of 110°. The detachable lens hood along with the filter window for a better control and comfort of use and the 95 mm filter thread make this lens the best in its class tool for professional photographers. 3 high refractive lenses, 2 ED lenses, 2 aspherical lenses guarantee a very low distortion. The Focus Lock system, special weather and dust sealing, the infinity click, a rear filter slot are all combined in the solid aluminium alloy construction that makes Irix the best companion in every photographic situation. This practical and professional lens is designed by our engineers to give you a precision tool that sets new standards for the way you work, in an affordable package. The Irix 15mm Firefly is a manual, super-wide-angle lens that allows you to include much more of the scene for a greater sense of space and incredible effects. It's the perfect lens for landscape, architectural and even interior photography. This versatile lens will adapt to every situation and the results are impressive, to say the least. The built-in hyperfocal distance scale gives you precise information about the depth of field for each shot. The ergonomic focusing ring incorporates a convenient click-stop for the infinity setting. An innovative focus lock lets you easily set the focus anywhere on the scale and keep it there for consistently repeatable results and to help avoid focus drift. With a minimum focus|Neutrino coating for minimum ghosting, CA and flare|Innovative Focus lock|Lightweight ABS construction|Ergonomic focus ring|protective carrying pouch included"