Leica APO-SUMMICRON-M 35mm F/2 ASPH.

This Leica prime covers the full frame format on the Leica M mount. It offers a single 35mm focal length at f/2, a pairing made for street, travel and documentary photography. Released in 2021, it remains in production, so it is a current design rather than an older model.

A 35mm view keeps room around a subject, so the setting stays in the frame. Focusing is manual, with no autofocus motor, and there is no built-in stabilisation. Those two omissions set the working style. You trade the speed of autofocus and stabilisation for a small, simple body and direct control.

The lens weighs 11.3 oz (320 g) and measures about 2.09 in (53 mm) across and 1.61 in (40.9 mm) long. Those measurements make it small and light for a full-frame 35mm prime. Screw-in filters fit directly and must match the 39mm thread.

A 35mm focal length frames a street corner, a café table or a small group without stepping far back. It also suits environmental portraits, because the subject shares the frame with the surrounding scene. For tighter framing you move closer, and the lens focuses as near as 1 ft (30 cm).

The f/2 maximum aperture admits more light, which helps indoors, at dusk or under street lighting. That extra light matters for evening street scenes, where flash would change the mood. Opened wide, it also separates a subject from a busy background. A 35mm view still keeps more context in the frame than a longer focal length would.

Eleven aperture blades help the opening stay close to round as you stop down. Rounder openings render out-of-focus areas more smoothly, which can show in backgrounds at wider settings.

Maximum magnification is 0.18x. Stopped down, depth of field grows, which supports presetting focus for quick candid shots. Our optics rating for this lens is 71 out of 100.

The body is sealed against dust and moisture. Sealed gaps limit where particles and moisture can enter, so the design reduces ingress risk.

A fluorine coating is part of the listed feature set. Fluorine coatings generally repel water and oil, so droplets and fingerprints may adhere less strongly and be easier to wipe away when they do. This is a general property of the coating type; results can vary with conditions.

There is no image stabilisation. In dim light you rely on shutter speed, ISO and a steady hold, since nothing inside the lens corrects camera shake.

The design includes aspherical and bi-aspherical elements. Their specially shaped surfaces help correct optical faults, including distortion and spherical aberration, which can curve straight edges in pictures of buildings.

The name carries APO, and its specification lists a chromatic aberration reduction value of 6. Colour fringing tends to appear on high-contrast edges such as branches against bright sky, so the correction aims to keep those edges clean.