Viltrox AF 40mm F2.5 Air

The Viltrox AF 40mm F2.5 Air is a compact prime for full-frame Sony E and Nikon Z cameras. It arrived in 2024 and is still in production. Choose the mount version that matches your system, since the two are separate lenses.

A 40mm view sits slightly wider than a standard view. That makes it a comfortable everyday lens for street, travel and candid people photography, where you want a natural perspective and light gear.

The main trade-off is a modest F2.5 maximum aperture and no lens stabilization or sealing. In return, the lens stays very light and small for a full-frame prime.

This lens weighs just 5.9 oz (167 g), so it barely registers on a camera or in a bag. The Sony E version is 2.34 in (59.5 mm) long and 2.56 in (65 mm) across.

A screw-in filter attaches directly to the 52mm thread, and any filter type works if it matches that size.

The single 40mm focal length gives a slightly wide normal view on full frame. It frames people, street scenes and interiors without the exaggerated perspective of a wider lens. Working with a fixed focal length also makes you frame by moving, which many photographers enjoy on everyday shoots.

The F2.5 maximum aperture admits a useful amount of light for evening streets and dim interiors. It also softens backgrounds, though only gently; at portrait distance the separation is modest rather than dramatic. Stop down when you need more depth for grouped people or layered scenes.

Seven aperture blades help keep out-of-focus highlights evenly shaped when you shoot wide open, so evening lights blur into soft shapes. Close focusing at 1.1 ft (34 cm) lets you fill the frame with a plate of food or a market stall detail. Maximum magnification is 0.14x, so recorded subjects stay modest in size.

Our optics score for this lens is 78.

There is no image stabilization in the lens. If your camera body stabilizes images, that system covers this lens. If not, steady handheld technique carries more weight in dim light, and a small prime is easy to hold still.

The lens has no weather sealing, so it has no protection against dust or moisture. Keep it dry and sheltered in rain, spray or wind-blown dust. The Sony E version also has no fluorine coating, a layer that helps water and oil slide off some lenses. Wipe the front glass as needed.

One aspherical element uses a specially shaped surface that helps correct optical faults such as distortion and spherical aberration. Distortion can make straight edges appear curved in the interiors and street scenes this lens often frames. A low-dispersion element helps reduce chromatic aberration, where colours focus differently and form fringes along high-contrast edges.

Internal focusing moves elements inside the barrel, so the lens does not extend while focusing. Our construction score is 54.