• Aperture Range: f/4 to f/22
• Three Aspherical Elements
• Two ED and Four HR Elements
• Neutrino Coating
• Manual Focus Design with Focus Lock
• Rubberized Focus Ring
• Depth of Field and Focus Distance Scales
• Weather-Sealed ABS Plastic Housing
• Rounded Nine-Blade Diaphragm

The Firefly version of the 11mm f/4 lens features a lightweight ABS plastic exterior construction that is sealed against moisture and dust along the main body of the lens. The Firefly construction also incorporates a rubber focus ring for improved grip and control, and has printed focus distance and depth of field scales to aid working with pre-focusing and hyperfocal focusing techniques.

Ultra wide-angle prime designed for full-frame DSLRs, this lens can also be used on APS-C models

Three aspherical, four high-refractive index, and two extra-low dispersion elements are featured within the optical design to limit both spherical and chromatic aberrations, as well as color fringing and distortion, for improved clarity, sharpness, and even illumination.

A Neutrino coating has been applied to limit lens flare and ghosting for improved contrast and color fidelity.

Manual focus designed is benefitted by a positive focus lock mechanism to secure your focus position at any point to limit unwanted shifting of focus.

A hard click stop indicates the infinity position on the focus ring for easy use in low-visibility conditions.

Large depth of field scale benefits using hyperfocal and pre-focus techniques.

Built-in petal-shaped lens hood blocks stray light in order to reduce lens flare, and also protects the front element of the lens.

Rear of the lens accepts 30 x 30mm cut gel filters.

Rounded nine-blade diaphragm contributes to smooth bokeh.

Focal Length     11mm
Maximum Aperture     f/4
Minimum Aperture     f/22
Format Compatibility     Full-Frame
Angle of View     126°
Minimum Focus Distance     10.83" / 27.5 cm
Optical Design     16 Elements in 10 Groups
Diaphragm Blades     9, Rounded
Focus Type     Manual Focus
Image Stabilization     None
Filter Size     Gel Filter (Rear)
Dimensions (DxL)     4.65 x 4.06" / 118 x 103 mm
Weight     1.6 lb / 730 g