Panasonic Lumix DG 25mm f/1.7 ASPH

The Panasonic LUMIX G25mm f/1.7 is a standard prime for Micro Four Thirds cameras. It suits street scenes, people and everyday details. A fixed focal length means you choose a position for the view you want, with no zoom ring to change framing from that spot.

The bright f/1.7 aperture is the main reason to buy this lens. The trade-off is the fixed 25mm framing. You change the picture by moving closer or further away, not by turning a zoom ring.

Panasonic introduced the lens in 2015. Its small body suits a light everyday kit. Check whether a standard view fits your subjects, especially in restricted spaces. There is no stabilisation or weather sealing.

At 4.4 oz (125 g), this is a light lens for a small body. It extends 2.05 in (52 mm) from the mount and spans 2.39 in (60.8 mm) wide, so it adds little bulk. A screw-in filter must match the 46mm thread. It scores 64/100 on physical specifications.

On Micro Four Thirds, 25mm gives a standard view. It suits meals, family pictures and street scenes with some surroundings included. How much fits depends on the space available and your position. Moving closer changes perspective as well as framing, so check the relationship between the foreground and background.

The f/1.7 maximum aperture lets in more light than a smaller opening. At the same shutter speed, it can allow a lower ISO in dim rooms. A nearby subject can have a soft background when there is enough space behind it. Focus carefully when working close with shallow depth of field.

Closest focus is 0.8 ft (25 cm), measured from the sensor. It can help with food, flowers and tabletop objects. Leave enough room ahead of the lens for light to reach the subject. Stop down when more depth of field is needed, then adjust exposure for the reduced light.

A distant subject occupies less of the frame than it would with a longer lens from the same position. Check this before choosing equipment for an event.

The lens itself has no image stabilisation. Steady handheld work relies on sensible shutter speeds, a brace against a wall, or a tripod when light drops. Any stabilisation must come from the camera body, so check that before buying if dim-light handheld shots matter to you.

There is no weather sealing, so protect the lens from rain, sea spray and heavy dust. Remove loose grit before wiping the front glass. Keep both ends capped in your bag, and check the mount is clean when changing lenses.

The optical path uses eight elements in seven groups, and two of them are aspherical. These specially shaped surfaces help correct distortion and spherical aberration. Distortion bows straight edges, so the correction matters for the lines in streets and interiors.

One UHR element is also included in the design. This high-refractive-index glass helps the designer control the light path within a compact optical system. The formula describes design choices; it does not establish measured sharpness or autofocus performance on its own.