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Irix Firefly 11mm F/4 Lens
For Pentax K Mount
Weatherproof - Seals protect from dust, humidity and light splashing.
Fixed focal-length. No zoom.
Rectilinear are normal lenses that show straight lines as straight lines.
No thread to mount front filters.
Manual Focus Only lens.Lens Description
The Irix Firefly 11mm F/4 is an ultra-wide prime designed for cameras with a Full-Frame sensor. This prime has a 11mm focal-length.
This prime lens focuses down to 27.5cm from the imaging plane, capturing subject with a maximum 0.07X magnification. The lens is not capable of autofocus and so the focus-distance must always be manually adjusted via the focus-ring.
The lens weighs 730g. Its body is weatherproof against adverse weather such as rain and snow. Seals in key areas prevent entry of water and dust.
This version of the lens has a Pentax K mount. It directly attaches and is fully compatible with all Pentax K mount cameras with Full-Frame or smaller sensors. Irix also makes this lens for Canon EF and Nikon F mounts.
Focal-Range
Angle-Of-View
Maximum Aperture
Viewing Angle Range
Maximum Aperture
Magnification
Weight
Irix Firefly 11mm F/4 Specifications
| Brand | Irix | Model | Firefly 11mm F/4 |
|---|---|---|---|
| Mount | Max FLM | 1X | |
| Focal Length | 11mm | View Angle | 126° |
| Max Aperture | F/4 | Min Aperture | F/22 |
| Min Focus | 27.5cm | Magnification | 0.07X |
| Filter Size | Aperture Blades | 9 | |
| Size (D x L) | 118 x 103mm | Weight | 730g |
| Tilt | N / A | Shift | N / A |
| Stabilization | Protection | Weatherproof | |
| Zoom Drive | N / A | Focus Drive | Manual Focus only |
| Zoom Mechanism | N / A | Focus Mechanism | Internal |
| Hood | Fixed | Focus Motor | N / A |
| Perspective | Rectilinear | Introduced | 2017-03-02 |
| Features | Rear 30x30mm Gelatin Filter Slot. | ||
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Irix 11mm F/4 Facts
Weatherproof - Seals protect from dust, humidity and light splashing.Fixed focal-length. No zoom.Rectilinear are normal lenses that show straight lines as straight lines.No thread to mount front filters.Manual Focus Only lens.| 11mm Focal-Length | F/4 Constant Aperture |
| No filter thread | Manual Focus only |
| Pentax K Mount | Full-Frame Coverage |
| 730g Lens Weight | 118 x 103mm (D x L) |
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