Sigma 85mm F/1.4 DG DN | A

Sigma introduced this 85mm f/1.4 Art prime in 2020. It covers full-frame mirrorless cameras, with separate versions for L-Mount and Sony E. Choose the lens that matches your camera mount. The focal length and bright aperture suit portraits, weddings and evening events.

Its main trade-off is fixed framing. You move closer or farther away to change the composition when the space permits. At a crowded reception or in a small room, that movement can be limited. A wider lens includes more of the scene from the same position.

The L-Mount version weighs 1 lb 6.2 oz (630 g) and measures 3.26 in (82.8 mm) across and 3.7 in (94.1 mm) long. The Sony E version is slightly lighter and longer. Both use a 77mm thread, so a screw-in filter must match that size to attach directly.

For a head-and-shoulders portrait, 85mm lets you stand farther back than a wide-angle lens at the same subject size. That change of position alters perspective and gives the person more space. The focal length also suits tighter views of ceremonies where you cannot stand beside the subject.

The f/1.4 maximum aperture gives more light than a smaller opening. In a dim reception, that gives more room to choose a faster shutter speed or lower ISO. The available light still sets the limit. A person dancing or walking needs enough shutter speed for their movement.

At close portrait distances, f/1.4 gives a thin zone of sharp focus. Focus on the eye that matters most and check the result if the person turns. A distant background can become soft. Stop down when more of the face or a second person must stay sharp.

Closest focus is 2.8 ft (85 cm), measured from the sensor. Maximum magnification is 0.12x, so very small details remain modest in the frame. For a close portrait or table object, check the framing before you settle on a shooting position. Leave space ahead of the front glass.

Dust and splash resistance help during outdoor portrait sessions. Use cover in persistent rain. Keep the lens mount clean and dry when changing lenses so moisture does not enter at the camera connection.

There is no built-in stabilization. A camera with body stabilization can help with shake for still subjects. Steady support is useful during slow exposures or long posed sessions. Opening the aperture can allow a faster shutter speed, but it does not provide stabilization.

Both versions have a water- and oil-repellent front coating. It helps spots and fingerprints wipe away during cleaning. Remove loose grit before using a cloth.

The design uses 15 elements in 11 groups. One aspherical element helps correct distortion and spherical aberration, which can bend lines or soften detail. Five SLD elements help reduce chromatic aberration, the coloured fringes that can appear along high-contrast edges such as backlit hair.