Sony FE 90mm F/2.8 Macro G OSS SEL90M28G

This Sony E-mount prime covers full-frame cameras and reaches life-size magnification. The 90mm focal length suits close work on plants, insects and small products. It also works as a portrait lens. Sony introduced it in 2015.

Its fixed focal length is the main framing trade-off. You change position to alter the composition, where the subject and space allow. It suits photographers who want detailed close-ups and occasional portraits in one lens. A zoom offers more framing choices from a fixed position.

The lens weighs 1 lb 5.2 oz (602 g). It measures 5.14 in (130.5 mm) long and 3.11 in (79 mm) across the body. Those dimensions make it a substantial prime rather than a compact one. A screw-in filter must match the 62mm thread on the front.

At 90mm, you can frame a portrait from farther back than with a wide-angle lens at the same subject size. That change of position alters perspective and can give a pleasing balance between the face and background. For macro subjects, check the actual clearance in front of the glass before placing lights or a reflector.

Life-size magnification means the image on the sensor is the same size as the subject. Closest focus is 0.9 ft (28 cm), measured from the sensor, not the front glass. At life size, depth of field becomes very thin. A small lean can shift focus, so steady support helps when you want one precise detail sharp.

The f/2.8 maximum aperture gives more light than a smaller opening for portraits and general photography. At high magnification, allow for reduced light transmission and a very thin sharp zone. Stopping down can bring more detail into focus, though it also requires more light, a slower shutter or a higher ISO.

For tabletop work, a focusing rail lets you adjust the camera position in small steps. Outdoors, a breeze can move a petal out of the sharp zone. Check focus at the detail that matters most. If you stop down, also check that the shutter speed still suits the subject movement.

Built-in stabilization reduces camera shake during handheld use. It can help on a garden walk when support is awkward. At high magnification, small movements still have a strong effect on focus and framing. A swaying stem or moving insect needs enough shutter speed for its movement.

The design resists dust and moisture for outdoor use. Use cover in persistent rain. The front glass lacks a fluorine coating, so it lacks that specific help with water and oily marks. Remove loose grit before wiping spots or fingerprints, particularly after working near soil.

The optical design includes aspherical glass to help correct distortion and spherical aberration, which can bend lines or soften detail. ED and Super ED glass help reduce coloured fringes at high-contrast edges. Backlit petals and shiny insect wings are subjects where those fringes can become visible.