Panasonic Lumix G 20mm F/1.7 ASPH

Last updated (13 May’13):
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Panasonic Lumix G 20mm F/1.7 ASPH is a compact and lightweight “pancake” lens announced September 2009 as the companion of the Lumix DMC-GF1 Micro Four Thirds camera (also can be used with Olympus PEN systems). The lens features 20mm ‘perfect normal’ fixed focal length; fast F1.7 maximum aperture, ‘Focus by wire’ manual focus system, with Ultra-thin, lightweight design. The lens measures 63mm diameter x 25.5mm length (2.5 x 1.0 in) and weighs approx. 100g (3.5 oz)

Overall Rating: ★★★★½

Expert Reviews

Panasonic Lumix G 20mm F1.7 ASPH Reviews

SLRGear reviews the Panasonic Lumix G 20mm F1.7 ASPH and writes;
“With excellent results for sharpness, resistance to chromatic aberration and essentially no distortion, Panasonic has done well with the 20mm ƒ/1.7, and we’ve been having fun shooting with it. For a really compact shooting package, the lens is a worthwhile investment.”
Rating: ★★★★½ reviews the Panasonic Lumix G 20mm F1.7 ASPH and writes;
“The Panasonic 20 1.7 is a lens I can easily recommend. I do not see anyone not liking it. This may be old news as this lens has been out for a while and there are probably a million reviews out there for it already. I just wanted to throw my take in to the mix in a “real world” kind of way. .”
Rating: N/A reviews the Panasonic Lumix G 20mm F1.7 ASPH and writes;
“Imatest showed it to be capable of high resolution through its aperture range, with the highest performance being between f/3.2 and f/7.1…Edge sharpness was generally very good and lateral chromatic aberration was negligible across all aperture settings”
Rating: N/A reviews the Panasonic Lumix G 20mm F1.7 ASPH and writes;
“The build quality of lens is excellent and we’d certainly like to see more of this in future lenses. The focus-by-wire approach (manual focusing) may be odd at first but you should be able to used to it in no time. The AF performance is very good. “
Rating: N/A

Features & Specifications

Panasonic Lumix G 20mm F1.7 ASPH Features & Specifications

Panasonic unveiled a new pancake interchangeable lens called the LUMIX G 20mm / F1.7 ASPH. (35mm camera equivalent: 40mm) as a new member of the LUMIX G Micro System. The new LUMIX G 20mm / F1.7 ASPH. Features a dramatic compactness and light weight despite its F1.7 brightness allowing a beautiful soft focus for photos to be even more impressive. Comprising of seven lenses in 5 groups, the new lens system uses two aspherical lenses most effectively to minimize both distortion and chromatic aberrations, achieving super high resolution corner to corner.

The versatile 20mm of focal distance (Equivalent to 40mm on a 35mm film camera) is suitable for wide variety of occasions from daily snapshots including sceneries like sunsets and dimly lit indoor shots to the deliberately creative shots taking advantage of its beautiful soft focus. When mounted on the LUMIX G Micro System Cameras, the LUMIX G 20mm / F1.7 ASPH. allows use of the advanced contrast AF system, which includes a Face Recognition function, for more convenient, more enjoyable shooting.

Seven blades give the aperture a rounded shape that produces an attractively smooth effect in out-of-focus areas when shooting at larger aperture settings. The new LUMIX G 20mm / F1.7 ASPH. lens also features a highly reliable metal mount, and uses multi-coated lens elements that minimize ghosts and flare to further enhance its optical performance.


– LUMIX G 20mm / F1.7 ASPH. (35mm camera equivalent: 40mm)
– Lens Construction 7 elements in 5 groups (2 Aspherical lenses)
– Mount Micro Four Thirds mount
– Optical Image Stabilizer No
– Focal Length f=20mm (35mm camera equivalent 40mm)
– Aperture Type 7 diaphragm blades / Circular aperture diaphragm
– Aperture F1.7
– Minimum Aperture F16
– Closest Focusing Distance 0.2m / 0.66ft
– Maximum magnification Approx. 0.13x / 0.25x (35mm camera equivalent)
– Diagonal Angle of View 57°
– Filter Size φ46mm / 1.81 in
– Max. Diameter φ63mm / 2.48 in
– Overall Length Approx. 25.5mm / 1.00 in (from the tip of the lens to the base side of the lens mount)
– Weight Approx. 100g / 3.53oz
– Standard Accessories Lens Cap, Lens Rear Cap, Lens Storage Bag

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