Sirui will announce four new full-frame autofocus lenses, with the Aurora AF 15mm F1.6 priced between $535 and $538, according to images and specifications published by Asobinet and relayed by SonyAlphaRumors.

The wide-angle prime is the only model in the batch with a confirmed price so far. At roughly half the cost of comparable fast ultrawides from Sony, Sigma or Nikon, it targets budget-conscious working shooters who need a fast 15mm for astrophotography, interiors or event work without committing four figures to a single focal length.

What do the published specs say?

The Aurora AF 15mm F1.6 breaks down as follows:

• Price: $535–538
• Mounts: Sony E, Nikon Z, Leica L and Fujifilm X
• Focal length: 15mm, full-frame coverage
• Optical construction: 17 elements in 12 groups
• Maximum aperture: F1.6
• Minimum aperture: F16

The published spec sheet cuts off after the aperture figures, so details on filter threads, minimum focus distance, weight and weather sealing remain unconfirmed. Sirui has not yet published an official announcement, availability date or regional pricing.

How should buyers treat the other three lenses?

As rumors, for now. The source identifies four full-frame AF lenses in total but supplies images and specifications only for the 15mm F1.6. Nothing concrete — pricing, focal lengths, aperture values or ship dates — has surfaced for the remaining three models. Photographers planning purchases around this lineup should treat those units as unannounced until Sirui or its distributors confirm them.

What does this mean for the market?

The mount selection matters as much as the price. Supporting E, Z, L and X at launch would put Sirui's autofocus line across every major mirrorless system except Canon RF, mirroring the strategy the Chinese maker has used in its manual-focus anamorphic and cine lenses.

A 17-element optical formula in a $535 lens also signals how aggressively Sirui is positioning itself against Sigma and Samyang in the value-prime segment. The open question, as always with first-generation autofocus optics from manufacturers new to AF, is focusing performance: speed, consistency in low light and eye-AF behavior will determine whether the price advantage survives real-world scrutiny on paid assignments.

Buyers will also want to see measured distortion and coma figures before committing — a 15mm F1.6 is primarily an astro and architecture tool, and both applications punish optical compromises that marketing sheets don't disclose.

Sirui's official announcement, expected shortly, should confirm pricing for the full four-lens set and firm delivery dates.