Irix 11mm f/4 Firefly Lens for Pentax K

The Irix 11mm f/4 Firefly is an ultra-wide rectilinear lens built for full-frame and APS-C shooters who need an extreme wide-angle for landscape, architecture, and astrophotography. It suits photographers working in harsh outdoor conditions who need a lens sealed against moisture, dust, and sand. This version mounts in Pentax K.

• 126° Field of View: An ultra-wide rectilinear design captures a 126-degree field of view with minimal distortion (3.13%).
• 16 Elements in 10 Groups: Includes 4 refractive, 2 ED, and 3 aspherical elements for sharp, detailed images.
• Weather-Sealed, Internal Focus: A sealed body resists moisture, dust, and sand, and the lens doesn't change length while focusing, keeping debris out of the mirror chamber.
• Electronic Iris with EXIF Data: An electronic module enables semi-automatic PASM exposure modes and EXIF data recording.
• Infinity Click and Focus Lock: A tactile infinity click and a focus lock ring make zone-focusing and astrophotography focus easy to nail and hold.
• Rear Gel Filter Slot: A rear gel filter slot accepts Gray ND filters, a feature unique to Irix's 11mm and 15mm lenses.
• Firefly Composite Build: The Firefly version uses lightweight composite construction with a rubber focus ring, and ships with a soft pouch.