Panasonic LUMIX G Series 20mm f/1.7

This is the original Panasonic Lumix G 20mm f/1.7 prime for Micro Four Thirds, introduced in 2009. The later II version followed in 2013. Its short body suits a small everyday camera for streets, travel, people and details. These specifications describe the original version.

The f/1.7 maximum aperture gives useful flexibility when light falls. The main trade-off is fixed framing. You cannot widen the view with a zoom ring when another person enters the scene. Choose it when a compact kit and a normal view match the pictures you want.

The original lens weighs 3.5 oz (100 g) and measures 1 in (25.5 mm) long and 2.48 in (63 mm) across. It adds little bulk in front of the camera. The body and strap still affect how the complete kit carries. Screw-in filters must match the 46mm front thread to attach directly.

The 20mm focal length gives a normal view on Micro Four Thirds. It can show a person with some surroundings or isolate a larger everyday detail. A wider lens can include more of a small room when there is no space to step back.

Moving closer makes a subject larger and also changes perspective. Avoid placing the camera very near a face if you want natural-looking proportions. For a street scene, check the edges before taking the picture. A small shift in viewpoint can separate your subject from a distracting sign or pole.

The f/1.7 maximum aperture gives more room for a faster shutter speed or lower ISO than a smaller opening. A nearby subject can have a soft background when there is enough space behind it. Stop down when several people or objects at different distances need to stay sharp.

Closest focus is 0.7 ft (20 cm), measured from the sensor. Maximum magnification reaches 0.13x, useful for larger details such as a meal or table setting. Leave room ahead of the front glass and avoid shading the subject. Small objects will occupy less of the frame.

There is no stabilization built into the lens. A camera with body stabilization can help reduce shake for still scenes. Moving people still need enough shutter speed for their movement. A firm support remains useful for a carefully framed night scene or a long exposure.

There is no weather sealing, so protect the lens from rain and blowing dust. Keep caps in place when it is off the camera. Let a wet camera bag dry before storing equipment in it, and avoid leaving grit around the lens mount.

The front glass lacks a fluorine coating. Remove loose grit before wiping water or oily marks, and keep cleaning pressure light.

Two aspherical elements help correct distortion and spherical aberration, which can bend lines or soften detail. These corrections matter when a picture includes windows, signs and other defined edges. The number of special elements alone does not establish the lens’s measured sharpness.