Irix 11mm f/4 Firefly Lens for Pentax PK

Reference: 11mmFireflyPentax

Condition: New product

Availability: On order - Usual delay 3-5 days

Ultra-wide, versatile premium lens, Firefly 11mm f / 4 lens is combined with sophisticated optical design and lightweight, durable physical construction. Aspherical elements, extra-low dispersion and high refractive index are used to suppress chromatic fringes, chromatic and spherical aberrations, as well as instantaneous distortions. A treatment has been applied to limit glare and ghosting to facilitate contrast and color accuracy when buying under extreme conditions.

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Irix 11mm f/4 Firefly Lens for Pentax PK
Ultra-wide, versatile premium lens, Firefly 11mm f / 4 lens is combined with sophisticated optical design and lightweight, durable physical construction. Aspherical elements, extra-low dispersion and high refractive index are used to suppress chromatic fringes, chromatic and spherical aberrations, as well as instantaneous distortions. A treatment has been applied to limit glare and ghosting to facilitate contrast and color accuracy when buying under extreme conditions.
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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