Irix 11mm f/4 Blackstone Lens for Pentax K

The Irix 11mm f/4 Blackstone for Pentax K is an ultra-wide rectilinear lens built for full-frame and APS-C shooters who need an expansive 126-degree field of view with minimal distortion. The Blackstone edition's reinforced full-metal construction is aimed at photographers who want the toughest build in the Irix 11mm lineup, backed by a hard case rather than the Firefly edition's soft pouch.

• 126° Field of View: An ultra-wide rectilinear design for full-frame (35mm) and APS-C Canon, Nikon, and Pentax K cameras.
• 16 Elements in 10 Groups: Includes 4 refractive, 2 ED, and 3 aspherical elements for minimal distortion (3.13%) and almost no vignetting.
• f/4.0 Aperture with 9 Rounded Blades: A 28cm focus distance combined with the aperture design produces smooth bokeh from an ultra-wide perspective.
• Reinforced Full-Metal Blackstone Construction: Engraved, UV-reactive-paint-filled markings for focusing in the dark, with a hard case included.
• Weather-Sealed, Internal Focusing: Protects against moisture, dust, and sand without changing the lens's physical dimensions while focusing.
• Electronic Iris Control and Focus Confirmation: Supports PASM modes, EXIF recording, and an in-viewfinder focus confirmation icon or sound.
• Rear Gel Filter Slot: A unique feature on the 11mm and 15mm Irix lenses for mounting gray ND filters behind the lens.