Autofocus Cine Glass Is for One-Person Crews, Not a Replacement for Your 1st AC

Autofocus has arrived on geared cine zooms, on anamorphics and, soon, on a full set of Nikon cinema primes. That is excellent news for the one-person crew and almost irrelevant to a set that already has a good 1st AC. Buy these lenses because you have no focus puller, not because you want to stop paying one, and test them for the problems that will show up in the edit rather than on the spec sheet.

What has actually shipped

Three manufacturers are now committed to the idea that cinema glass should focus itself. Here is the state of play as of early October 2026.

• Sigma AF Cine 28-45mm T2 FF. The first lens in Sigma's AF Cine line, priced at $3,399 in L-mount and Sony E-mount. Sigma's press release lists 0.8 pitch gears, a clickless iris, a linear HLA focus motor and a focus ring with a fixed 200-degree rotation. It went on sale in November 2025.
• Sigma AF Cine 28-105mm T3 FF. Also $3,399 in E and L mount, 1.3 kg, released 16 April 2026 and based on the 28-105mm F2.8 DG DN Art stills lens, according to RedShark News.
• Sirui Astra. A 50mm, 75mm and 100mm set, 1.33x squeeze, T1.8, full frame, $849 per lens in E, Z and L mount. They weigh 620 to 720 g and began shipping on 15 December 2025, as reported by Digital Camera World. They are billed as the first full-frame 1.33x anamorphics with autofocus.
• Nikon NIKKOR Z Cinema T1.9 VV. On 8 September 2026 Nikon announced it is developing nine T1.9 primes with an image circle large enough for the V-RAPTOR [X] VV sensor and "a highly precise autofocus mechanism", per ProVideo Coalition. RedShark reports that the first lens, a 50mm, is expected around NAB 2027 and that the others may follow some way behind. Nikon has not announced prices or the full list of focal lengths.

What the first serious review found

PetaPixel's review of both Sigma zooms (20 July 2026, shot mainly on a Panasonic S1 II) is the most useful test we have found. Three findings matter for post.

• Neither zoom is parfocal. The reviewer found the 28-105mm "drifted dramatically while zooming", and even the 28-45mm shifted focus enough to move it "from my subject's eyes to their nose". If you zoom during a shot, you are relying on autofocus or a manual correction to rescue it.
• Breathing varies by lens. The 28-45mm shows "fairly noticeable breathing at both ends of its zoom range". The 28-105mm was better, with slight breathing at the wide end and very little at the long end.
• AF speed is stills-lens speed. The reviewer found it indistinguishable from Sigma and Panasonic photo lenses. That is good, but it also means the autofocus behaves like a stills autofocus: fast, decisive, and driven by whatever the camera body thinks the subject is.

The focus is by wire, built to feel mechanically coupled. That matters because a wireless follow-focus can only hit repeatable marks if the ring position maps to the same distance every time. Sigma's fixed rotation range suggests it does, but check it on your own body and firmware.

Where autofocus shows up in the edit

A focus puller makes decisions about story: who is in focus, when the rack starts, how long it takes. Autofocus makes decisions about faces and contrast. In the cutting room the difference looks like this:

• Hunts and false locks. A human puller who misses a mark leaves a soft take, which is obvious and can be retaken. A hunting AF often leaves a take that is 90% usable, with a half-second breath in the middle. These are the takes that burn edit time, because you keep trying to save them.
• Racks you did not choose. When a second face enters the frame, the camera may move focus to it. On a documentary that can be a happy accident; on a scripted two-hander it is a continuity problem.
• Breathing that grading cannot fix. An AF lens that breathes turns every small focus correction into a small zoom. On a locked-off interview with continuous AF, a breathing lens can make the frame pulse slightly as the subject leans. A punch-in plus stabilisation can hide some of it, at the cost of resolution.
• Anamorphic de-squeeze. A 1.33x squeeze on a 16:9 recording de-squeezes to roughly 2.37:1 (our arithmetic: 1.78 x 1.33). Make sure your monitor and NLE de-squeeze correctly, and check that the camera's subject detection works reliably on a squeezed image. We have not found an independent test of the Astra's AF on that point, so treat it as something to check yourself before a paid job.

Our position: one-person crews, yes; replacing a 1st AC, no

Autofocus cine glass makes the most sense when nobody else could pull focus anyway: a shooter-producer on a gimbal, a walk-and-talk with a two-person documentary crew, a wedding or event camera, a single operator running an interview while also directing it. For those jobs, a T2 zoom with cine gears that can still be pulled by hand, plus face tracking, is a real upgrade on a stills lens with a focus-by-wire ring that does not repeat.

On a set with a 1st AC, the advantage largely disappears. The puller is choosing focus for the story, reading rehearsals and riding marks. Lens AF does not do that. The more useful feature for that crew is that these lenses still have gears and a manual mode, so the same lens can serve the B-camera operator on their own and the A-camera with a puller.

What to test before you buy

1. Zoom while recording. Set focus at the long end and zoom out, then do it the other way. Note how far focus drifts and whether AF corrects without visible hunting.
2. Breathing at both ends. Rack from minimum focus to infinity at the widest and longest focal lengths, and play it back at 100% in your NLE, not on the camera screen.
3. Two faces. Put two people at different distances and have them trade lines. Count how many unwanted racks you get in two minutes.
4. Repeatable marks. In manual mode, mark three distances on the ring, power-cycle the camera, and check the marks still land.
5. Your body, your firmware. AF performance depends on the camera. A review on a Panasonic S1 II does not tell you how it will behave on your Sony or Nikon Z body.
6. Anamorphic only. Test subject detection with de-squeeze on and off, and confirm that your NLE and grading templates handle the 1.33x pixel aspect without manual fixes.

The takeaway

Autofocus cine lenses solve a staffing problem, not an image problem. If your crew is one or two people, they will save takes you would otherwise lose. If you already pay a 1st AC, keep paying them, and treat AF as a backup for the second camera. Whichever you choose, put a breathing test and a two-face test in your evaluation, because the problems these lenses create show up in the edit, not on the spec sheet.