Sony E 50mm F/1.8 OSS SEL50F18

This Sony prime is a 50mm lens for Sony E mount, made for APS-C cameras. On that format it frames like a short telephoto, a natural fit for portraits, street detail and candid pictures of people.

The f/1.8 aperture is the main draw. It gathers plenty of light for indoor work and softens backgrounds behind a portrait subject. OSS stabilisation helps as well, so handholding stays practical in dim rooms. Together they suit evening gatherings, cafés and window-lit interiors.

The trade-off is the fixed focal length. You frame by moving closer or stepping back, and there is no weather sealing for rough conditions. Sony introduced the lens in 2011 and still makes it today.

At 7.1 oz (202 g) this lens adds little weight to an APS-C camera, so it is easy to carry all day. It measures 2.44 in (62 mm) across and the same in length.

A screw-in filter must match the 49mm thread, and a polariser or protective filter fits directly. The physical specification scores 57.

A 50mm focal length on APS-C gives a useful working distance for portraits. You can frame a face without standing extremely close, which helps keep perspective natural. Indoors, allow space to step back. In a small room, the narrow view may make groups harder to fit.

The f/1.8 maximum aperture does two useful jobs. Compared with a smaller aperture, it gives you more room to keep shutter speeds usable indoors without raising ISO as far. It can also blur a busy background, especially when the subject stands well ahead of it.

Closest focus sits at 1.3 ft (39 cm), measured from the sensor. That suits tabletop details, while portraits usually benefit from more distance. Maximum magnification is 0.16x, so very small objects will not fill the frame as they would with a dedicated close-up lens.

At f/1.8, close portraits can have thin depth of field. Focus carefully on the nearer eye. Stopping down increases depth of field, but the aperture needed for both eyes or a group depends on distance and how people are arranged. The optics specification scores 81.

The OSS stabilisation is the standout feature here. It counteracts camera shake, so you can hold slower shutter speeds and still get sharp pictures of static subjects. It steadies the camera only. For a moving child or pet, keep the shutter speed up yourself.

OSS can also reduce small hand movements in video. It does not remove every jolt from walking with the camera. There is no weather sealing, so keep rain and dust away from the lens. There is no fluorine coating on the front glass, so clean smudges with ordinary care.

The features specification scores 22.

Inside are nine elements in eight groups, a simple layout for a compact prime. The design uses no aspherical or low-dispersion glass. Focusing is internal, so the barrel does not extend as you adjust focus toward a nearby subject.