Sirui Sirui Astra Series T1.8 1.33x 50mm Full-Frame Review

The Sirui Astra 50mm T1.8 is a budget-friendly full-frame anamorphic lens for L-mount cameras. It delivers a sharp, cinematic 2.4:1 image with neutral flares and even includes autofocus, making it a great first step into the anamorphic world without a huge investment.

If you're hunting for a modern, affordable anamorphic lens to get that cinematic 2.4:1 look without breaking the bank, the Sirui Astra 50mm T1.8 is squarely in your sights. It's a full-frame, 1.33x squeeze lens designed for L-mount cameras, offering autofocus and a fast T1.8 aperture for under $850. That's a pretty compelling package for filmmakers and content creators who want to step up their visual game without stepping into the five-figure price range of traditional cine glass. The lens promises neutral streak flares, oval bokeh, and no cropping to achieve the widescreen aspect ratio, which is a big deal for anyone trying to maximize their sensor's real estate.

Our data shows this lens excels optically, landing in the 95th percentile for sharpness and clarity. That means you're getting a lot of detail for the money. The trade-off is in other areas. Its autofocus performance sits in the 45th percentile, which is fine for controlled, slower-paced shots but might not keep up with fast-moving subjects. There's no stabilization built in, and the minimum focus distance of 1.6 feet (about 500mm) means you won't be doing any extreme close-ups. For typical interview setups or narrative scenes, though, the optical quality is the star of the show.

At $849, the Sirui Astra 50mm sits in a sweet spot. It's significantly cheaper than dedicated cinema anamorphics from brands like Atlas or Cooke, which can cost tens of thousands. You're giving up some build quality, exotic coatings, and maybe ultimate sharpness, but you're getting 95% of the look for a fraction of the price. The main alternatives are other affordable anamorphic options, often manual focus only, or using spherical lenses and cropping in post, which sacrifices resolution.

This lens is playing a different game than the listed competitors like the Meike 55mm or Nikon Z 35mm f/1.8. Those are excellent spherical photo lenses. The Sirui Astra is specifically for video creators who want the anamorphic look: oval bokeh, horizontal lens flares, and a widescreen aspect ratio straight out of camera. If you don't need that specific cinematic aesthetic, a standard prime like the Viltrox 35mm will be sharper, faster focusing, and more versatile for photography. But if you want anamorphic on a budget, and especially with autofocus for solo shooters, the Sirui has a clear niche.

Skip this lens if you're a still photographer—it's a video-first tool. Also, pass if you need macro capabilities or very close focusing, as its minimum distance is over 1.5 feet. If you shoot run-and-gun style without a gimbal, the lack of image stabilization might be a dealbreaker. For those use cases, a stabilized standard zoom or prime is a better fit.

Should you buy this? If you're a filmmaker, YouTuber, or content creator with an L-mount camera who's been itching to try the anamorphic look, this lens is a fantastic and relatively low-risk way to do it. The image quality is great, and having autofocus is a huge bonus. But if you're primarily a stills photographer, need close focusing, or shoot in unpredictable conditions, this specialized tool isn't for you. For its intended purpose—creating affordable cinematic video—it delivers.