OM System M.Zuiko Digital ED 17mm f/1.2 PRO

The M.Zuiko Digital ED 17mm f/1.2 PRO is a prime lens for the Micro Four Thirds mount and format. Its 17mm focal length gives a slightly wide, natural view for everyday photography. The f/1.2 maximum aperture is the main draw.

OM System released this design in 2017. The trade-off is the fixed focal length: you frame by moving closer or stepping back, not by zooming. In return, the lens stays compact and easy to carry all day.

The lens offers no stabilisation of its own. Instead it concentrates on optical speed in a sealed, portable body.

The lens weighs 13.8 oz (390 g). It measures 3.43 in (87 mm) long and 2.69 in (68.2 mm) wide, so it packs small. A screw-in filter attaches directly and must match the 62mm front thread.

A 17mm focal length on Micro Four Thirds gives a versatile, walk-around view. It takes in a street corner or a dinner table without the dramatic stretch of a wider lens. That makes it a good fit for reportage, interiors and environmental portraits, where the subject should keep its surroundings.

The f/1.2 aperture is the headline specification. It admits far more light than a typical zoom, so you can hold usable shutter speeds in dim restaurants, bars and evening streets.

Wide open, it also separates a near subject from a busy background. Nine aperture blades keep the opening round, which helps out-of-focus highlights stay smooth. The depth of field at 17mm is generous, so focus placement is forgiving at everyday distances.

Focusing works down to 0.7 ft (20 cm). That lets you photograph a market stall or a plate on a table while keeping the wider scene in the frame. Our optics assessment scores the lens at 89.

The lens is weather sealed against dust and rain. You can keep shooting through drizzle on a street walk or a dusty trail without bagging the camera. Full protection depends on a sealed camera body too.

There is no image stabilisation in the lens. Any shake reduction has to come from the camera body. The bright aperture helps you keep shutter speeds high enough to hand-hold in low light, which softens the practical impact.

The front element has no fluorine coating. That leaves no water- and oil-repellent layer, so a smudged or rain-spotted front glass needs more deliberate cleaning. The features score for this lens is 32.

The optical formula uses 15 elements in 11 groups. Three aspherical elements help correct distortion and spherical aberration. That matters here, because street scenes often include straight lines such as building edges and horizons.

Five low-dispersion elements help reduce chromatic aberration, the coloured fringes that can show along high-contrast edges like branches against a bright sky. Internal focusing keeps the lens the same length while it focuses.