Irix 11mm F4 Firefly & Blackstone
Specifications
The Irix 11mm F4 does not carry the list of acronyms often plaguing modern lenses. It does include modern multi-coatings called "neutrino" and a complex optical design.
Below are the lens specifications.
| Lens Name |
Irix 11mm F4 Blackstone |
Irix 11mm F4 Firefly |
| Optical Formula | 16 elements in 10 groups | |
| Image Circle | 35mm (Full frame) | |
| Auto-Exposure Support | Yes | |
| Construction | Metal, fluorescent lettering | Plastic |
| Field of View | Diagonal / Horizontal APS-C: 105 ° / 95 ° Full frame: 126 ° / 117 ° | |
| Aperture Range | F4 - F22 | |
| Aperture Blades | 9 rounded | |
| Aperture Ring | No | |
| Max. Magnification | 0.077x (1:13) | |
| Focus Type | Manual (with focus lock) | |
| Minimum Focusing Distance | 27.5 cm | |
| Internal Focus | No | |
| Filter Thread Diameter | NA (front), 30x30mm (rear) | |
| Cap | Plastic, cover pinch-type | |
| Hood | Yes, petal built-in | |
| Case | Hard case | Soft pouch |
| Diameter x Length | 118 x 103 mm (4.65 x 4.06 inches) | |
| Weight | 790 g | 730 g |
| Pentax Mount Designation | KA | |
| Weather Sealing | Full WR | Partial WR (front element excluded) |
| Price (US MSRP) | $524.95 USD | |
| Launch Date | 2017 | |
