User manual
IRIX 11mm f 4 Firefly Lens

User Manual for IRIX 11mm f 4 Firefly Lens for Nikon F

• Product category: SLR Lenses IRIX
• Brand: IRIX
• Description and content of package
• Technical information and basic settings
• Frequently asked questions – FAQ
• Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
• Authorized service for IRIX SLR Lenses

Product description

• 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 FX-format Nikon F-mount DSLRs, this lens can also be used on DX models where it provides a 16.5mm equivalent focal length.

• 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.

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Technical parameters

IRIX 11mm f/4 Firefly Specs

Focal Length	11mm
Maximum Aperture	f/4
Minimum Aperture	f/22
Lens Mount	Nikon F
Format Compatibility	Full-Frame
Angle of View	126 Rating 90% users recommend this product to others. And what about you? This product has already been rated by 95 owners. Add your rating and experience with the product. Discussion Ask our technicians if you have a problem with your settings, or if anything is unclear in the user manual you have downloaded. You can make use of our moderated discussion. The discussion is public and helps other users of our website who may be encountering similar problems. The discussion is empty - enter the first post Post a new topic / query / comment: Items marked with * are required. Your name *: E-mail : Subject *: Message *: Your email address will not be displayed. Do not forget to fill it in if you want to receive a reply to your enquiry/contribution. Processing of personal data in accordance with GDPR