Sigma 15mm F1.4 DC Contemporary

This Sigma 15mm F1.4 DC Contemporary is a wide-angle prime built for APS-C cameras. Sigma sells it in Sony E, Fujifilm X and Canon RF mounts, so pick the version that matches your system. It arrived in 2026 and remains in production, so it is a current design rather than an older model.

The 15mm focal length and bright F1.4 aperture point this lens at the night sky. Star fields, dim interiors and tight architectural spaces are its natural territory. The main trade-off is the fixed focal length. You frame by moving rather than zooming, so a standard zoom stays the more practical everyday companion.

This prime weighs 7.8 oz (220 g), so it stays comfortable on an APS-C body all evening. It runs 2.55 in (64.8 mm) long, and the Sony E version measures 2.52 in (64 mm) across. The 58mm front thread takes screw-in filters directly.

At 15mm on an APS-C sensor, this prime gives a very wide view. That suits star-filled skies, where you want whole constellations in one frame, and interiors or courtyards where you cannot step back further. Small rooms, old streets and open landscapes all fall inside its reach.

The F1.4 aperture is the reason this lens exists. It gathers more light than a typical slow wide angle, so you can keep ISO low for cleaner night frames. Shorter exposures also hold stars as points before trails form, delaying the need for a tracker.

Indoors, the same speed lets you work handheld in rooms lit by lamps or a window, without raising ISO. Depth of field stays deep at 15mm even wide open, so foreground and background usually both stay sharp across the frame.

Close focusing reaches 0.6 ft (17 cm). You can place a foreground detail, a rock or a doorway frame, near the camera and still keep the wider scene behind it recognizable. This near-far approach gives flat wide scenes a stronger sense of depth.

The lens has no built-in image stabilization. Steadiness must come from your camera body, if it stabilizes, or from a tripod. The wide view helps at slow shutter speeds, but night-sky exposures and handheld video still need that support. For static night landscapes on a tripod, the absence costs little.

Weather sealing is fitted, which suits outdoor night sessions, dusty trails and damp coastal mornings when the lens stays exposed for long stretches.

The Sony E version also carries a fluorine coating on the front element. It helps water and oil bead away, so the glass wipes clean quickly after a night under dew.

Thirteen elements in eleven groups include three aspherical elements, and all three are bi-aspherical. Their shaped surfaces help correct distortion and spherical aberration. Distortion curves straight edges, a real concern in architecture and interiors, so this design work fits the lens's likely subjects.

Focusing is internal, so the barrel length stays fixed while you adjust focus.