Sirui Astra Series AST-50-LB 50mm

Sirui delivers genuine anamorphic blue flares and autofocus on a budget, but sacrifices build quality and speed to get there. Get it for the cinema vibe, not for everyday photography.

Optical quality surprised us in a good way — it sits in the 72nd percentile in our database, which means sharpness and contrast are well above average for a lens like this. But the autofocus is easily the biggest letdown, landing near the bottom of the charts and hunting noticeably in anything dimmer than a well-lit set. The lack of stabilization also means you'll want a gimbal or tripod for smooth shots, because handheld video can get jittery fast. For the price, the image circle does a nice job covering full-frame without vignetting, though corners soften a bit wide open.

The lenses that sit next to this on the shelf are mostly zooms like the Nikon Z 18-140mm f/3.5-6.3 VR or the Canon RF-S 18-150mm, both far more versatile but completely devoid of anamorphic character. The Sigma 10-18mm F2.8 DC DN gives you a bright wide-angle option for crop sensors, while the Viltrox 9mm F2.8 is even wider and faster, but again, no blue flares or oval bokeh. If you want that distinctive cinematic personality with autofocus and full-frame coverage, none of those can touch the Sirui. But if you need a do-it-all lens for stills and video, those zooms will serve you far better in daily use.

Prices swing from $849 to $1,154 across vendors, so shop around — that $305 gap buys a nice ND filter or extra battery. Under $900, it's a unique proposition: an autofocus anamorphic lens for full-frame Nikon Z shooters. You're paying for the cinematic look and the convenience of AF, not for optical perfection. For video-first creators on a budget, it's worth it. For everyone else, you can get more practical glass for less.

Sirui's Astra 50mm T1.8 is a full-frame anamorphic lens with autofocus for Nikon Z, and that alone makes it a curiosity worth paying attention to. It delivers the classic blue streak flares, oval bokeh, and a 2.4:1 widescreen look straight out of camera without cropping, all for a price that won't require a second mortgage. But the magic comes with trade-offs: build quality is mediocre, the autofocus is slow and unreliable in low light, and it's not weather-sealed. If you're building a video-centric kit and the anamorphic aesthetic is your north star, this is a solid entry point. Just don't expect it to replace a general-purpose prime for stills.

If you're a stills photographer looking for a sharp, reliable 50mm prime, skip this entirely. The Nikon Z 50mm f/1.8 S is better built, faster to focus, noticeably sharper, and costs less. This Sirui is a video-first lens for people who want anamorphic character, not for portrait sessions or pixel-peeping.

If you're specifically after an anamorphic lens with autofocus for your Nikon Z rig, the Sirui Astra 50mm T1.8 is the most accessible way in right now. It's not a flawless lens — the AF can be frustrating, the build is cheap, and it asks for careful light and steady hands — but it nails the cinematic aesthetic at a real-world price. For indie filmmakers and content creators chasing that widescreen magic without a huge crew, this is a fun, creative tool. For stills shooters, though, it's a niche curiosity that will mostly collect dust.