"The extremely wide Full Frame rectalinear lens with an angle of view of 126deg.. 4 high refractive lenses, 2 ED lenses, 3 aspherical lenses guarantee a very low distortion of 3,13% which makes this lens unique in its class. The Focus Lock system, special weather and dust sealing, the Infinity click, a rear filter slot and UV reactive markings (Blackstone version) are all combined in the solid aluminium alloy construction that makes Irix 11 mm lens unbeatable tool for landscape, architecture, nightscape and extreme photography (images). The Irix 11mm f/4.0 Blackstone is compatible with full frame and APS-C sensors. As a fixed focal lens, it has a higher technical quality than wide angle zoom lenses and it will oblige you to look for the best frame for each photograph. You will be in absolute control of your own work. You will have an angle of view of 126deg. to work with. This 11mm wide angle lens is suitable for all photographers, whether you're a landscape photographer, a nature photographer, architecture, interior or astrophotographer. The exterior housing is designed to be very durable. All markings are engraved with UV fluorescent paint to glow when using a little UV flashlight. This and the infinity stop make it perfect for night photography. The 11mm does not have front threads for a filter but you can insert 30x30mm gel filters in the rear filter slot.|Angle of view of 126deg. and a focus distance of 0.275 m (0.9 ft)|Clearly-labeled infinity position for the focus ring with a noticeable click-stop to make it easy to find, even in the dark|Ideal for landscape, nature, architecture, real estate photography and astrophotography|UV reflective, engraved markings, ideal for night photography|4 highly refractive lenses (HR), 2 ED lenses and 3 aspherical lenses guarantee minimal distortion, as low as 3.13%|Focus lock allowing you to maintain the chosen setting at any time|Weather sealed construction resists the elements for use in the harshest conditions|Blackstone version lens features - Aluminium internal construction and magnesium housing with anti-scratch finish - Metal Focusing ring - Engraved Markings - - Weather sealed front lens element -"