TTArtisan 10mm f/2

This 2023 ultra-wide prime is made for APS-C mirrorless cameras, and it remains in production. It comes in Sony E, Canon RF, Fujifilm X, Micro Four Thirds and Nikon Z versions, so pick the one made for your camera.

At 10mm it sweeps whole rooms, tall facades and broad landscapes into the frame. The f/2 maximum aperture suits night skies and dim interiors. It will appeal most to architecture, interior and travel photographers who welcome an exaggerated sense of space.

In exchange, you set focus by hand and work without stabilization.

The Sony E version weighs 12.2 oz (345 g) and runs 2.44 in (62 mm) across by 2.56 in (65 mm) long. That is a small, light package that pairs well with compact APS-C bodies.

Its front takes screw-in filters, which must match the lens's 72mm thread. Sizes and weights for the other mounts differ.

A 10mm focal length on APS-C gives an extreme wide-angle view. Small rooms open up, tall buildings fit from across the street, and distant subjects shrink quickly. In tight interiors you can shoot from corners and doorways that would defeat a standard zoom. To fill the frame you step toward the foreground, and that near subject supplies the drama.

The f/2 aperture is fast. It keeps shutter speeds workable in dim interiors and at dusk. For star fields it allows shorter exposures, reducing star trails. Its eight blades shape the aperture as you stop down, which helps form sunstars around bright lights.

Depth of field runs deep at 10mm, so much of the scene stays sharp even wide open. Expect broad sharpness rather than blurred backgrounds, since the wide view keeps distant objects small. Tilting the camera leans verticals, so keep the frame level for architecture.

Close focusing at 0.8 ft (25 cm) lets you place a rock, doorway or railing just in front of the lens. Focus is manual, but the deep zone makes exact settings forgiving. The optics score is 63 out of 100.

There is no image stabilization. Camera shake matters less at 10mm than at longer focal lengths, and the f/2 aperture keeps shutter speeds up, so handheld work stays practical. On a tripod, as for night skies, the omission costs little.

Weather sealing is absent. In steady drizzle or dusty trails, tuck the camera inside a jacket between shots. On the Sony E version a screw-in filter can add front protection. Nothing here stops everyday outdoor use in fair weather.

The front element has no fluorine coating, so keep a cloth handy for fingerprints and spray.

Thirteen elements sit in ten groups, two of them aspherical. Aspherical surfaces use specially shaped curves that help correct optical faults such as distortion and spherical aberration. Distortion can make straight edges appear curved, and straight walls matter in architecture, so this shaping has a clear job here. The construction score is 15 out of 100.