Irix Blackstone 15mm f/2.4 - Monture Pentax vs Rokinon 14mm f/2.8 IF ED UMC - Monture Pentax
Prices & availability
Specification comparison
Highlighted rows differ between the two models.
| Specification | Irix Blackstone 15mm f/2.4 - Monture Pentax | Rokinon 14mm f/2.8 IF ED UMC - Monture Pentax |
|---|---|---|
| Mount | ||
| Mount | pentax-k | pentax-k |
| Optics | ||
| Focal (difference) | 15 mm | 14 mm |
| Aperture (difference) | f/2.4 | f/2.8 |
| Prime | Yes | Yes |
| Stabilization | No | No |
Verdict
Pick the Irix Blackstone 15mm f/2.4 if you prioritize a brighter f/2.4 aperture and slightly longer reach for low-light or astrophotography. Opt for the Rokinon 14mm f/2.8 if budget is key and the wider 14mm field of view matters more for your composition—its f/2.8 aperture and lower price still deliver solid performance. The Irix stays the better choice if you need the extra half-stop of light or prefer its focal length, while the Rokinon wins on cost and wider angle.