• Aperture Range: f/2.4 to f/22
• Two Aspherical Elements
• Two ED and Three 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

In addition to the imaging performance, this 15mm f/2.4 utilizes a manual focus design for fine-tuned control, and incorporates a unique positive focus lock to secure the focusing position at any point for consistent, repeatable shooting. As the Firefly version of this focal length, this lens is also distinguished by a lightweight ABS plastic exterior, printed lens markings, and weather-sealing about the lens housing to permit working in trying environmental conditions.

The Firefly version of the 15mm f/2.4 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.

Wide-angle prime designed for full-frame DSLRs, this lens can also be used on APS-C models where it provides a 24mm equivalent focal length.

Two aspherical, three 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.

Front of lens has 95mm-diameter filter threads and the rear of the lens accepts 30 x 30mm cut gel filters to lessen the likelihood of vignetting.

Rounded nine-blade diaphragm contributes to smooth bokeh.

Focal Length     15mm
Maximum Aperture     f/2.4
Minimum Aperture     f/22
Format Compatibility     Full-Frame
Angle of View     110°
Minimum Focus Distance     11.02" / 28 cm
Optical Design     15 Elements in 11 Groups
Diaphragm Blades     9, Rounded
Focus Type     Manual Focus
Image Stabilization     None
Filter Size     95 mm (Front)
Gel Filter (Rear)
Dimensions (DxL)     4.49 x 3.94" / 114 x 100 mm
Weight     1.3 lb / 581 g