If you happen to’re on the lookout for an ultra-wide angle rectilinear prime, the Irix 15mm f/2.Four Blackstone is a superb worth

irix 15mm f/2.4 blackstone
Nikon D750, Irix 15mm f/2.Four Blackstone. Publicity: 1/100 sec., ƒ/22, ISO 180.

If you happen to’re on the lookout for an ultra-wide angle rectilinear prime for landscapes, architectural and journey images, the Irix 15mm f/2.Four Blackstone is a superb worth.

Accessible in Canon EF, Nikon F and Pentax Ok mounts, it compares very favorably in value to comparable choices from Canon and Nikon. Although neither model makes a precise equal, the slightly-wider Canon EF 14mm f/2.8L II USM carries an inventory value $2,099, whereas the Nikon AF Nikkor 14mm f/2.8D ED retails for $1,894. Evaluate these costs to the 15mm f/2.Four Blackstone’s estimated road value of $599, and contemplate that the Blackstone is one-half cease sooner with its most aperture of ƒ/2.4.

To be truthful, each the Canon and Nikon 14mm primes are autofocus lenses; the Irix 15mm is handbook focus solely. This can be a deal-breaker for some, however for panorama images that doesn’t demand the pace of autofocus, we didn’t contemplate it a lot of a compromise. And although there’s no AF, the lens aperture is managed electronically by the digicam.

irix 15mm f/2.4 blackstone

To help in setting focus, the 15mm f/2.Four Blackstone has an engraved, fluorescent distance scale permitting you to find out your depth-of-field at ƒ/8, ƒ/11 and ƒ/16 apertures. As you rotate the main target ring, there’s a tactile “click on” while you attain infinity. One other good function of the lens is its minimal focusing distance of 9.84 inches, permitting you to get shut while you need to emphasize foreground objects. There’s additionally a spotlight lock ring to forestall unintentional adjustments.

The Blackstone design has a strong, premium really feel. The housing is constructed of an aluminum and magnesium alloy, which makes for a satisfying weight and conjures up confidence within the total construct high quality. It’s additionally climate sealed on the entrance lens ingredient, digicam mount and focus and focus lock rings to guard towards mud and moisture.

The lens accepts 95mm filters, and Irix presents a choice of filters together with a round polarizer, UV and impartial density filters. There’s additionally a rear filter slot that accepts gelatin filters, accessible in a set of a number of ND strengths from Irix.

Although designed to be used with full-frame cameras, it will also be used with APS-sensor fashions, offering an equal focal size of about 22.5mm on a Nikon physique and 24mm on a Canon.

General, we had been impressed with the picture high quality produced by the lens. At bigger apertures, the lens does exhibit vignetting, and it’s fairly pronounced on the most aperture of ƒ/2.4, however this impact is almost eradicated at ƒ/Eight and minimal on the smallest apertures. Just like the vignetting, sharpness on the edges of the body is softer at bigger apertures, however improves considerably as you cease down. For panorama images, you’ll most likely be capturing at smaller apertures anyway to maximise your depth of area.

irix 15mm f/2.4 blackstone
Nikon D750, Irix 15mm f/2.Four Blackstone. Publicity: 1/60 sec., ƒ/22, ISO 100.

Contemplating the lens as an entire—development, design, optical efficiency and value—we just like the Irix 15mm f/2.Four Blackstone. It’s an amazing worth for photographers wanting so as to add an ultra-wide choice to their equipment however who aren’t in a position to justify paying 3 times (or extra) of the Blackstone’s value for the first-party lens choices. Contact: Irix, irixlens.com.

Irix 15mm f/2.Four Blackstone Key Specs

Focus System: Guide
Diagonal Discipline of View: 110 levels
Most Aperture: ƒ/2.4
Minimal Aperture: ƒ/22
Aperture Design: 9-blade, rounded
Minimal focus distance: 9.84 inches
Optical Development: 15 components in 11 teams
Mounts: Canon EF, Nikon F, Pentax Ok
Dimensions (DxH): 4.49” x 3.94”
Weight: 1.51 kilos (Canon); 1.44 kilos (Nikon)
Estimated road value: $599

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