Leica Summilux-M 35mm f/1.4 ASPH.

Leica launched this 35mm f/1.4 prime in 2022 for the M mount, and it covers full frame. It is a recent design rather than a carry-over from an older generation.

One fixed focal length and a bright aperture make it a natural fit for street photography, reportage and travel. It also suits environmental portraits, where a person and their surroundings share the frame. Framing changes only as you move.

The trade-off is convenience. Focusing is manual, there is no stabilisation, and the body is not sealed against dust or moisture. In return you get a compact, simple lens that rewards a deliberate, unhurried way of working.

The lens weighs 11.9 oz (338 g) and measures just 1.81 in (46 mm) long and 2.28 in (58 mm) wide. That is a small, light package, so an M camera stays easy to carry all day. It also accepts screw-in filters, which must match the 46mm thread.

The 35mm focal length sits between wide and normal on a full-frame camera. The view has only a mild wide bias, so scenes look natural, which suits candid street work and reportage. Faces keep their proportions when you step closer for a portrait. The frame still holds enough surroundings to give a subject context.

The f/1.4 aperture is the main reason to choose this lens over slower options. It lets you shoot handheld in dim restaurants, galleries and evening streets without pushing ISO too far. Opened wide, it also gives a shallow depth of field that lifts a subject away from a busy background.

Eleven aperture blades help keep the opening round when you stop down. Out-of-focus highlights then stay smooth rather than angular, which flatters portraits and night street scenes. The lens focuses as close as 1.3 ft (40 cm), enough for a plate on a table or a market detail.

Focusing is manual, with no autofocus motor. The ring gives direct control over where the plane of focus sits, which matters at f/1.4, where the sharp zone is thin.

There is no image stabilisation. At 35mm you can use fairly slow shutter speeds handheld before shake appears. In very dim light, raise the ISO or steady the camera against a doorframe or table.

The body is not weather sealed, so heavy rain and sea spray are best avoided. There is no fluorine coating on the front element either. Smudges and rain spots will not shed on their own, so carry a cloth and clean gently.

As a fixed prime, the lens has no zoom ring or autofocus electronics. That keeps the design simple and the body slim, and it leaves the aperture and focus rings as the only controls you need.

Nine elements sit in five groups, and one of them is aspherical. A specially shaped surface like this helps correct distortion and spherical aberration. That correction is useful for a 35mm lens that frames buildings, doorways and street furniture alongside people.