Sigma's AF Cine Zooms: Autofocus Glass That Finally Feels Mechanical

Cinema lenses have always forced a choice: mechanical manual focus that feels connected to your hand, or autofocus that feels like a photo lens wearing a costume. Sigma’s new AF Cine zooms are the first pair that don’t make you choose.

Why This Comparison Matters

Autofocus cine lenses exist because run-and-gun video work — documentary, corporate, solo-operator content — often can’t afford a dedicated focus puller. But every autofocus cine lens up to now has traded away the one thing narrative cinematographers actually want: an electronically-controlled focus ring that still feels mechanically coupled, with the kind of resistance and precision that lets an operator pull focus by feel rather than by watching a monitor.

Sigma built two lenses to close that gap: the 28-45mm T2 and 28-105mm T3, derived from the photo-side 28-45mm f/1.8 Art and 28-105mm f/2.8 Art, now in E-Mount and L-Mount cine housings with geared iris, zoom, and focus rings and a standard 95mm front diameter.

What Makes It Different

The standout isn’t the autofocus — it’s the manual focus. The Phoblographer’s review describes the electronically-controlled focus ring as delivering “responsiveness and a feeling of connection to be in line with the mechanical Sigma Aizu Primes,” Sigma’s flagship mechanical prime line. That’s a specific, testable claim: a focus-by-wire system that doesn’t feel like one. Pair that with autofocus speed and responsiveness the review calls comparable to Sigma and Panasonic’s existing photo lenses, and operators get a lens that works handheld and unmanned, and switches to precise manual pulls without feeling like a compromise.

Both lenses resolve 8K easily, with pleasing out-of-focus rendering, and the Cine AF versions show more flare and ghosting than their photo counterparts — a characteristic some cinematographers actively prefer for a filmic look rather than the corrected-to-death rendering of stills glass. Linear motors drive the autofocus, and both lenses take 82mm screw-in filters, keeping them compatible with the matte boxes and filter systems most video shooters already own.

The Catch / Who It’s For

Neither lens is parfocal — focus shifts as you zoom, a real constraint for anyone zooming mid-shot rather than reframing between takes. The 28-45mm also shows breathing across its zoom range, the kind of frame-size shift during focus pulls that narrative cinematographers spend real money to eliminate on mechanical primes. Neither issue is a defect; both are the standard tradeoff cinema zooms make for autofocus and reasonable size, and Sigma isn’t hiding it.

That makes the audience specific: solo shooters, documentary crews, and corporate video teams who need one lens that autofocuses reliably and manual-focuses precisely when required, without a focus puller on set. Narrative productions with the crew and budget for parfocal mechanical primes have less to gain here — breathing and parfocal drift are exactly what that workflow is built to avoid.

Source: The Phoblographer

Content created with AI assistance and reviewed for accuracy.