Panasonic LUMIX G Series LEICA 10-25mm f/1.7 ASPH

This Panasonic LEICA zoom spans 10–25mm on Micro Four Thirds. It moves from an ultra-wide 10mm view to a standard 25mm one in a single twist. Landscapes, tight interiors, architecture and street work all sit inside that span. The range also suits video, where swapping lenses mid-scene is disruptive.

The constant f/1.7 maximum aperture is the main draw, since it gathers the same light at 10mm and 25mm alike. The trade-off is bulk: the lens is heavy for a Micro Four Thirds zoom and carries no built-in stabilisation. Panasonic introduced it in 2019.

The lens weighs 1 lb 8.3 oz (690 g) and runs 5.04 in (128 mm) long with a 3.46 in (88 mm) body. That is a solid presence on a compact Micro Four Thirds camera. A screw-in filter must match the 77mm thread on the front.

At 10mm, this zoom frames tight interiors and wide landscapes without stepping back. At 25mm, the same lens handles street scenes and rooms at a natural walking distance. The rotary ring moves you between those views with one twist.

The f/1.7 maximum aperture stays open across the whole range. Inside a dim church or out at dusk, that light keeps shutter speeds usable for handheld stills. It also lets the 25mm end lift a subject away from a busy background. Nine aperture blades help the opening stay round when stopped down, which smooths how out-of-focus areas render.

Close focusing reaches 0.9 ft (28 cm). That lets you place a foreground rock, doorway or railing near the frame edge and keep it sharp at a wide setting. The specification scores 87 for optics on our 100-point scale.

Stopped down, focal lengths this wide render scenes with deep depth of field, so front-to-back sharpness in a landscape needs only a modest aperture. You reach for smaller settings by choice rather than need.

The lens is weather sealed against dust and moisture. That suits its landscape and architecture use, where wind-blown grit and drizzle are part of the day. You can keep shooting when the weather turns rather than packing the camera away.

Without built-in image stabilisation, handheld video can show camera movement, so a tripod or a steady hold matters at both ends of the zoom.

Two more items are absent. The front glass has no fluorine coating, so spray and fingerprints need ordinary cleaning. There is no zoom lock, so nothing holds the ring at your chosen focal length in transit. The features specification scores 32 on our 100-point scale.

Three aspherical elements use specially shaped surfaces to help correct optical faults such as distortion and spherical aberration. Distortion curves straight edges, a live concern when 10mm meets a building line. Four low-dispersion elements help reduce chromatic aberration, which draws coloured fringes along high-contrast edges. Focusing happens inside the barrel, so the lens does not grow longer as you focus.