Sirui has added two fast, full-frame autofocus primes to its Aurora line, and the 15mm F1.6 pushes the series to its widest focal length yet. Both of these sirui aurora autofocus primes launch for Sony E-mount and L-mount now, with Nikon Z and FUJIFILM X versions due in Q1 2027.
L-mount already has wide autofocus primes in the 14 to 24mm range from Panasonic, Sigma and Viltrox. Few of them combine this speed with a price this low. E-mount has a handful of comparable autofocus lenses, so the new pair adds competition there too.
If a fast 24mm with movements appeals to you, Venus Optics’ Laowa 24mm f/2 tilt-shift lens offers a specialist alternative in the same focal length.
Optics and focusing in the sirui aurora autofocus primes
The 15mm F1.6 uses 17 elements in 12 groups, including three aspherical, three ED and three HRI (high refractive index) elements. It covers a diagonal angle of view of 109.3 degrees on full frame. Sirui puts optical distortion at about 1.4 percent, but it does not say how much of that figure comes from the optics and how much from in-camera correction.
The 24mm F1.4 of the sirui aurora autofocus primes has 14 elements in 11 groups, with three aspherical, four ED and three HRI elements. Its diagonal angle of view is 82.93 degrees. The extra ED element is the main optical difference between the two designs.
Both lenses use a stepping motor, which Sirui calls STM, to drive autofocus. The motor works with the camera’s eye detection and subject tracking. The 15mm focuses as close as 0.3m (11.8 inches) and reaches a maximum magnification of 0.08x. The 24mm focuses to 0.26m (10.2 inches) and reaches 0.15x, or 1:6.67, which suits close detail and product work. Sirui claims low focus breathing for both lenses, though no reviewer has confirmed that yet.
Sirui compares the 15mm’s F1.6 maximum aperture with the F1.8 found on many fast ultra-wides. The company claims about 27 percent more light in theory, which equals one-third of a stop. That gap is small, but it matters for night exteriors and dark interiors.
Build and handling
Each of the sirui aurora autofocus primes has an 11-blade aperture with a ring that can be clicked or declicked. The aperture ring also locks, holding it at the A position or within the manual range. A programmable Fn button ships set to AF lock. An AF/MF switch sits on the barrel, and a USB-C port handles firmware updates.
The bodies are all-metal and dust- and splash-resistant. Each lens comes with a hood. Sirui says the 15mm and 24mm share the same control layout as the 35mm and 85mm in the series.
The filter threads differ. The 15mm takes 77mm (M77x0.75) filters, and the 24mm takes smaller 62mm (M62x0.75) filters, which cost less. For gimbal operators, a screw-in ND or polarizer is a real advantage on an ultra-wide, since many lenses at this focal length need a filter holder.
Weights sit near 550 grams. The 15mm measures 106.4mm long and weighs 542 grams in Sony E-mount, and 104.4mm and 550 grams in L-mount. The 24mm measures 106.6mm long and weighs 550 grams in E-mount, and 104.6mm and 560 grams in L-mount. Both lenses are nearly the same length. CineD’s reviewer suspects this makes gimbal rebalancing easier when swapping lenses, though Sirui has not said so.
Where the sirui aurora autofocus primes stand
The Aurora series began in October 2024 with the 85mm F1.4. The 35mm F1.4 followed in September 2025. With these two wides, the sirui aurora autofocus primes bring the line to 15mm to 85mm. Sirui joined the L-Mount Alliance in March 2025, and L-mount is a launch mount for these lenses.
On an APS-C body with a 1.5x crop, the 15mm frames like a 23mm lens on full frame. The 24mm frames like a 36mm lens.
Sirui’s compatibility list says most current Sony bodies work in photo and video modes. The a6000 is only partially compatible in video mode, so check the list before buying with an older body. Sirui backs both lenses with a three-year replacement warranty for failures not caused by misuse.
Pricing and availability
The sirui aurora autofocus primes are priced as follows: the 15mm F1.6 costs $599 and the 24mm F1.4 costs $499. In Europe, the lenses list at €649 and €539, including VAT. Both are available for pre-order now from retailers and Sirui’s store. The Nikon Z and FUJIFILM X versions are scheduled for Q1 2027.
At IBC 2026 in Amsterdam, Sirui’s Sonny Liu had put the price at $500 to $600 per lens, with availability in the next couple of months. The final prices landed at the two ends of that range, and the launch came less than two months after the show. The 24mm also undercuts the 35mm F1.4, which Sirui sells for $549.
For shooters who find $549 still steep, affordable vintage lenses with unique optical character are a worthwhile detour with their own distinctive rendering.
For L-mount shooters, the open question is no longer whether a fast, affordable wide autofocus prime exists. It is whether these two lenses hold up to the specifications on paper. Tests of sharpness, distortion and focus breathing will answer that.
H/T dpreview.com
Frequently asked questions
How much does the Sirui 15mm F1.6 autofocus prime cost?
The Sirui Aurora 15mm F1.6 costs $599 in the US and lists at €649 including VAT in Europe. It is available for pre-order now from retailers and Sirui’s store.
Which camera mounts do the Sirui Aurora 15mm and 24mm support?
At launch, both lenses are available for Sony E-mount and L-mount. Nikon Z and FUJIFILM X versions are scheduled for Q1 2027.
What filter sizes do the Sirui 15mm and 24mm autofocus primes use?
The 15mm F1.6 takes 77mm (M77x0.75) filters, while the 24mm F1.4 takes smaller 62mm (M62x0.75) filters. The article notes the 62mm filters cost less.
How close can the Sirui 24mm F1.4 focus, and what magnification does it reach?
The Sirui 24mm F1.4 focuses as close as 0.26m (10.2 inches) and reaches a maximum magnification of 0.15x, or 1:6.67. The article says this suits close detail and product work.
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