Viltrox AF 15mm f/1.7 Air

The Viltrox AF 15mm f/1.7 Air is a small wide-angle prime for APS-C mirrorless cameras. It comes in Fujifilm X, Nikon Z and Sony E mounts, so pick the version made for your system. Launched in 2025, it suits anyone who shoots interiors, street scenes, architecture or the night sky with one light lens.

The f/1.7 maximum aperture is useful to consider for dim interiors or evening streets. The main trade-off is the fixed focal length. You change position to adjust framing, so check whether the view fits your usual subjects and the space available. Walls and tables can limit that movement.

The Fujifilm X version weighs 6.3 oz (180 g) and measures 2.23 in (56.7 mm) long and 2.56 in (65 mm) across. Other mount versions differ in weight and length. Allow room for the hood and caps when packing. Screw-in filters must match the shared 58mm front thread.

At 15mm on an APS-C sensor, this lens gives a wide view. That suits interiors, narrow streets, architecture and expansive landscapes. How much fits in the frame depends on your distance from the subject, so you move forward or back to set the composition.

The f/1.7 maximum aperture admits more light than a smaller opening. At a given shutter speed, it can allow a lower ISO in a dim room or evening street. A close subject can have a soft background when there is enough space behind it. Focus carefully on the important detail.

For the night sky, choose your position to include the foreground you want. Check focus on a magnified view if the camera offers one. Test the exposure time for the amount of star movement you want. The wide view alone does not establish how stars will appear at the frame edges.

Closest focus is 0.8 ft (23 cm), measured from the sensor. This range can help place a flower or small object in the foreground. Leave room ahead of the glass for light and avoid shading the subject. Stop down when more depth is needed, then check both near and distant details.

There is no image stabilisation in the lens. A camera with body stabilisation can help with shake. Firm support helps during long exposures of still scenes, but moving people or plants still need a suitable shutter speed.

On the Fujifilm X version, the front coating helps resist splashes and marks. Remove loose grit before wiping the glass, and check for fingerprints before photographing towards a bright lamp. Protect the lens from persistent rain and blowing sand.

Keep the open mount sheltered during lens changes and fit both caps when the lens is off the camera. Dry the exterior before storage after a damp session.

Twelve elements in ten groups make up the optical path. Two aspherical elements sit within it. Their shaped surfaces help correct optical faults such as distortion, which wide views of buildings can expose. Three low-dispersion elements help reduce chromatic aberration, where colours fringe along high-contrast edges such as lit windows at night. Focusing is internal, so the barrel length never changes while you focus.