Viltrox AF 25mm f1.7 Air APS-C Lens for Sony E

The Viltrox AF 25mm f1.7 Air APS-C Lens for Sony E delivers a 37.5mm full-frame equivalent field of view in a fast, lightweight build under 170g. Its bright f1.7 aperture, leadscrew-type STM motor, and internal focusing support responsive, quiet autofocus with minimal breathing, ideal for video. Optical quality is prioritised through 12 elements in 10 groups, including ED, HR, and aspherical glass with HD Nano coating.

Key Features:

• 25mm APS-C lens providing a 37.5mm full-frame equivalent angle of view
• Bright f1.7 maximum aperture ideal for low light and shallow depth of field
• Leadscrew-type STM motor delivers fast, quiet, and accurate autofocus
• Supports face and eye detection on compatible Sony E-mount cameras
• Effectively reduces focus breathing for more natural video focus transitions
• 12 optical elements in 10 groups for high image clarity and minimal distortion
• Features 1 ED, 2 aspherical, and 2 high-refractive elements for sharp, corrected optics
• HD multilayer nano coating controls flare and ghosting in challenging lighting
• 9-blade rounded aperture enhances bokeh quality in both photo and video
• Internal focusing design helps maintain lens length during operation
• Minimum focusing distance of 30cm enables semi-macro style close-ups
• 0.11x maximum magnification for detailed near-subject shooting
• Full electronic integration with camera for aperture control and EXIF data
• USB-C port allows firmware updates to maintain compatibility and performance
• Includes lotus-style lens hood to reduce lens flare and protect the front element
• Lightweight construction weighing just 170g for easy daily carry
• Compact dimensions of 64mm diameter and 54.5mm length
• 52mm front filter thread allows standard ND or UV filter use
• Designed for APS-C Sony E-mount mirrorless camera systems

Focal length and angle of view

The Viltrox AF 25mm f1.7 Air is an APS-C wide-angle prime lens that delivers a 37.5mm full-frame equivalent field of view, ideal for documenting street life, casual portraits, and daily vlogging. Its 60° angle of view balances width and realism, closely matching human vision, making it a dependable choice for natural-looking compositions across photo and video.

Optical construction and coatings

This 12-element, 10-group design incorporates high-grade elements to improve clarity and reduce optical aberrations. One extra-low dispersion (ED), two high-refractive (HR), and two aspherical (ASPH) lenses work together to limit chromatic and spherical distortion. An HD multilayer nano coating suppresses flare and ghosting, especially in backlit conditions.

Aperture and bokeh quality

The bright f1.7 aperture allows greater control over depth of field and maintains image brightness in low-light environments. Combined with a 9-blade rounded diaphragm, it creates soft, natural bokeh for separation and visual impact. The electronically controlled aperture supports real-time adjustments via the camera body, giving users flexibility across lighting conditions.

Autofocus and focus control

Autofocus performance is driven by a leadscrew-type stepping motor, optimised for both stills and video. The internal focusing system ensures consistent framing while reducing noise, and minimal focus breathing preserves composition during focus shifts. The lens also supports face and eye detection on compatible Sony E-mount bodies for precise subject tracking.

Physical design and portability

Weighing just 170g and measuring 64 x 54.5mm, the AF 25mm f1.7 Air is built for portability without sacrificing performance. Its internal focus design ensures a consistent footprint during operation, and the included lotus-shaped hood protects the front element while further reducing stray light. A USB-C port allows easy firmware updates to keep the lens up to date.

What’s in the box?

• 1 x Viltrox AF 25mm f1.7 Air E Lens (Sony E)
• 1 x Front Lens Cap
• 1 x Rear Lens Cap
• 1 x Lens Hood

FAQs

Does the Viltrox AF 25mm f1.7 Air have image stabilisation?

No, the Viltrox AF 25mm f1.7 Air does not include built-in image stabilisation. For handheld video or low-light photography, it is best paired with a Sony E-mount camera that features in-body stabilisation. The bright f1.7 aperture can also help offset minor shake by allowing faster shutter speeds.

What is the filter size for this lens?

The lens accepts 52mm threaded filters on the front, making it compatible with a wide range of ND, UV, and circular polarising filters. This allows users to control exposure and reflections without the need for bulky matte boxes. The included lotus-shaped hood also provides some extra protection from stray light.

What is the minimum focus distance of the Viltrox AF 25mm f1.7 Air lens?

The minimum focusing distance is 30cm, allowing users to capture moderately close shots of small objects, food, or details. With a maximum magnification ratio of 0.11x, it is not a macro lens but still offers good versatility for casual close-up work. The internal focusing design helps maintain stable framing throughout.

Is the Viltrox 25mm f1.7 Air compatible with full-frame cameras?

This lens is designed specifically for APS-C format Sony E-mount cameras and will automatically switch full-frame models into APS-C crop mode. While it can physically mount on full-frame Sony bodies, the effective resolution will be limited to the APS-C area. For full-frame coverage, a different lens model is recommended.

Can the lens aperture be adjusted from the camera?

Yes, the lens supports full electronic aperture control via compatible Sony camera bodies. This allows users to make quick exposure changes in both still and video modes without touching the lens. EXIF data such as aperture, focal length, and focus distance is also transmitted to the camera.