Samyang 10mm f/2.8 ED AS NCS CS 10mm

The Samyang 10mm f/2.8 is a sharp, fast, and absurdly affordable ultra-wide prime for Canon APS-C DSLRs. It's fully manual with no chip, so you'll need patience and decent light to nail focus. Optical quality rivals far pricier glass, but sample variation means you should buy from a shop with easy returns. If astro, landscapes, or interiors are your thing, it's a no-brainer at around $299.

Sharpness is this lens's party trick. At f/2.8, the center is already crisp, and stopping down to f/5.6 or f/8 brings the edges right up. The optical score in our database reflects that strong performance, landing solidly in 'well above average' territory. For astrophotography, people rave about the pinpoint stars edge to edge (on a good copy), and the fast aperture makes it possible to keep ISO down even without a tracking mount. The close focusing distance of 9.5 inches isn't true macro, but the macro score in the 76th percentile shows it can pull off some surprisingly detailed wide-angle close-ups, which is fun for creative foreground interest.

The flip side is everything else. Bokeh is nothing to write home about, with a 6-blade diaphragm that produces hexagonal highlights. That's not a dealbreaker on an ultra-wide, where you'll rarely shoot shallow depth of field, but it's worth noting. The aperture ring is smooth and clicked, but on Canon bodies without electronic communication, you won't see the aperture in the viewfinder, you'll just trust the markings. And without stabilization, you need to keep that shutter speed up or use a tripod. Our stabilization percentile ranking is a low 34th, which means most modern lenses offer some sort of shake reduction. But again, that's not really the point of this affordable wide prime.

The most obvious rival in the Canon DSLR world is the Canon EF-S 10-18mm f/4.5-5.6 IS STM. It's a zoom with image stabilization and autofocus, and it's roughly the same price. If you're shooting video, need flexibility, or just hate manual focus, the Canon is the smarter buy. But it's two stops slower at the long end and doesn't resolve detail quite as nicely, especially toward the edges. On a tripod at f/8 for landscapes, the Samyang often comes out ahead in pure sharpness.

If you're willing to cross the mirrorless divide, the Sigma 10-18mm F2.8 DC DN is a newer, autofocus-equipped, weather-sealed zoom that costs more but is far more versatile. It's also much lighter and compatible with Sony E and L-mount. For Canon APS-C DSLR shooters, though, that Sigma simply won't mount. There's also the Viltrox AF 9mm F2.8 (for Sony E), which brings autofocus to a similar focal length, but again, not for EF-S bodies. Samyang's own 14mm f/2.8 for full frame is another option if you ever plan to move to a 5D or similar, but on crop sensor it loses that ultra-wide punch. For Canon DSLR folks who want the widest possible aperture and the sharpest possible stars, the 10mm f/2.8 remains in a class of its own.

Pricing for this lens is all over the place, ranging from a very reasonable $299 to a wildly unrealistic $72,339 across vendors. Obviously you'll want to ignore that second number, which is probably a listing glitch. The real deal is at Amazon, where the Samyang has consistently sat around the three hundred dollar mark. For what you're getting optically, that's a serious bargain. A Canon EF-S 10-18mm f/4.5-5.6 IS STM costs about the same but is much slower, and while you get autofocus and stabilization, you sacrifice that stop-and-a-half of light gathering and some corner sharpness. If your priority is absolute image quality in a fast wide prime, the Samyang gives you that for a bag of peanuts. Just factor in the possibility that you might need to exchange a copy if it arrives decentered.

The Samyang 10mm f/2.8 is a lens that doesn't care about your convenience. It's manual focus only, no electronic chip, no weather sealing, no stabilization. And yet, for a certain kind of shooter, it's one of the best deals in ultra-wide glass you can slap on a Canon APS-C DSLR. If you're the type who takes their time composing, sets focus by muscle memory, and judges a lens by the stars it can pull in, keep reading. If you want autofocus and EXIF data, maybe skip to the comparison section.

At its core, this is a 10mm prime (about 16mm equivalent on Canon's 1.6x crop) with a constant f/2.8 aperture. That fast maximum opening, combined with a 110-degree field of view, makes it a natural for astrophotography, tight interior shots, and dramatic landscapes. The optical formula packs 14 elements in 9 groups, including two aspherical elements and one ED glass, topped with Samyang's Nano Crystal Coating to cut down on ghosts and flare. On paper, the design is geared toward sharpness, and owners pretty much universally confirm it delivers.

But there's a catch, and it's one you'll see echoed across user forums and our own data. Samyang's quality control can be hit or miss. The lens can be wonderfully sharp, but we've seen enough reports of decentered optics and soft corners to suggest you buy from a retailer with a solid return policy. Our database puts optical performance in the 77th percentile, well above average, and user sentiment scores an 85/100 with a 4.7-star average across 240 reviews. That's high praise for a lens with zero automation, but the mixed experiences with sample variation keep it from being a no-brainer.

If you shoot fast-moving subjects or ever need to hand the camera to someone who just wants to press a button, walk away from this lens. The manual focus and lack of stabilization make it a poor choice for wildlife, sports, or casual family snapshots. Our database scores it a low 16.9 for wildlife and sports for good reason. You'll miss critical moments while you're turning a focus ring. And if you need consistent edge-to-edge sharpness for professional architectural work without messing around with copy variation, you're better off saving for a higher-tier lens with better quality control.

Video shooters should also think twice. Without image stabilization and with a short manual focus throw that's great for stills but tricky for smooth rack focuses, it's far from ideal for run-and-gun work. The Canon EF-S 10-18mm IS STM is a much better hybrid option. Alternatively, if you're open to mirrorless, the Sigma 10-18mm F2.8 DC DN gives you autofocus, stabilization, and weather sealing in a modern design, albeit at a higher price.

If you're building an astrophotography kit or shoot architectural interiors where you can take your time, the Samyang 10mm f/2.8 is a gem. The optical quality for the price is stupendous, and the manual focus ring has a long, damped throw that makes precise focusing a treat rather than a chore. Pair it with a sturdy tripod, focus at infinity during the day and tape it down, and you'll have a reliable night-sky warrior. Just make sure you test your copy thoroughly when it arrives, and be prepared to swap it if you spot decentering.

For anyone who shoots events, chases kids around the yard, or values the convenience of autofocus, this lens will frustrate you more than it delights. The lack of any electronic communication means no aperture control from the camera body on some models, and you'll miss shots while you fiddle with the focus ring. In that case, the Canon 10-18mm IS STM is a far better fit. And if you're already contemplating a jump to mirrorless, hold off and look at the Sigma 10-18mm F2.8 instead, it's a more modern, all-around lens that gives you both speed and autofocus.