Panasonic LEICA DG SUMMILUX 15mm f/1.7 ASPH. (H-X015)

This Panasonic Leica prime is a compact wide angle for Micro Four Thirds cameras. Its 15mm focal length gives a broad view, a natural choice for street, travel and everyday pictures. It suits photographers who want one light lens that captures a room or a street scene without stepping back. The small size keeps the whole camera unobtrusive in a crowd.

The bright f/1.7 maximum aperture makes it useful indoors and after dark. The main trade-off is the fixed focal length. You frame by moving rather than zooming, and the absence of a zoom keeps the lens small and light.

The lens weighs 4.1 oz (115 g). It measures 2.26 in (57.5 mm) across and 1.42 in (36 mm) long, so it adds little bulk to a compact body. Filters screw directly into a 46mm thread. Any screw-in filter you buy must match that thread diameter, whether it is a polariser or an ND.

The 15mm focal length frames a street corner, a café table or a small room without forcing you back against a wall. It is wide, but not so wide that faces near the frame edges stretch. That balance lets you work close to your subject and still show the setting.

The f/1.7 maximum aperture is the lens's strongest asset. It keeps shutter speeds usable in dim restaurants, shops and evening streets, and it brightens the viewfinder for composing in poor light. Set close to a subject, it also softens the background slightly, helping a plate of food or a market stall stand out.

You can focus as close as 0.7 ft (20 cm), so menus, shop windows and table details can fill much of the frame. At ordinary distances a 15mm view keeps most of the scene sharp, even at f/1.7. Strong background blur needs a longer lens or a much closer subject. The optical specification scores 82 out of 100.

There is no image stabilization in this lens. The wide 15mm view is easier to hold steady than a longer focal length, so handheld work in reasonable light stays practical. In very dim conditions, brace the camera or raise the ISO rather than relying on the lens.

The lens has no weather sealing, so keep it away from rain, spray and heavy dust. There is no fluorine coating on the glass either, so fingerprints and water marks need patient cleaning off the front element.

For street and travel, these gaps are manageable. The lens suits dry, walk-around conditions.

The design uses three aspherical elements. Aspherical surfaces are specially shaped to help correct optical faults such as distortion and spherical aberration. At a 15mm focal length, that work matters, because distortion can make straight edges such as building lines appear curved. Internal focusing moves the glass inside the barrel, so the lens keeps its length while focusing.