Panasonic Lumix G 20mm f/1.7 ASPH. Pancake Lens for MFT (Micro Four Thirds), Black/Dark Silver {46}

Panasonic 20mm f/1.7 pancake: the Micro Four Thirds street standard.

At 26mm long and 100 grams, this lens disappears onto any Micro Four Thirds body. The 40mm-equivalent field of view sits in the useful middle ground between wide and normal, and the f/1.7 maximum aperture pulls in enough light to shoot available-light interiors without reaching for a flash. Two aspherical elements keep the optical formula honest at wide apertures, controlling the coma and field curvature that plague simpler fast primes.

The 7-blade rounded diaphragm keeps out-of-focus backgrounds smooth across the aperture range. Minimum focus is 0.2m, which gives you enough working room for food, product details, and close environmental portraits. The micromotor autofocus is quiet than fast, and full-time manual override lets you nudge focus without toggling switches. The non-rotating 46mm filter thread is a small but practical detail if you're running a polarizer.

This is a lens that earns its reputation the slow way: years of consistent results across a wide range of shooting conditions. For a system built around compact bodies, it remains one of the most logical primes you can put in your bag.

Who It's For

Street photographers working in low-light conditions get a f/1.7 aperture in a package that doesn't telegraph itself. Travel shooters who want a single lens on a compact body benefit from the 100-gram weight and 1-inch profile. Documentary and reportage photographers appreciate the quiet micromotor and the 40mm-equivalent framing, which is wide enough for context but tight enough to isolate subjects. Food and still-life shooters can use the 0.2m minimum focus distance to work close without moving to a macro lens.

Key Features

• 20mm f/1.7 prime with 40mm equivalent field of view
• Two aspherical elements control coma and field curvature
• Seven rounded diaphragm blades for smooth bokeh
• Micromotor autofocus with full-time manual override
• Minimum focus distance 0.2m for environmental work
• Non-rotating 46mm filter thread
• Compact 26mm pancake design, 100 grams

FAQ

What's the field of view on this 20mm for Micro Four Thirds?

40mm equivalent. Sits between wide and normal, which is why it works for street photography, environmental portraits, and general purpose shooting without forcing you into ultra-wide territory.

How close can you focus with this lens?

0.2 meters (7.87 inches). Close enough for food, product details, and tight environmental work without needing a macro lens.

Is autofocus fast on this pancake?

No. The micromotor is quiet and smooth, built for stills work rather than continuous tracking. Full-time manual override means you can nudge focus without switching modes.

Will this lens rotate the filter thread when you focus?

No. The 46mm thread stays fixed, which matters if you're using a polarizer or ND filter and want to adjust it mid-shoot without losing your angle.

What makes the bokeh smooth on this lens?

Seven rounded blades in the diaphragm. The shape matters-rounded blades produce more circular out-of-focus highlights across the aperture range instead of the polygonal shapes from straight-edged designs.

How much does it weigh and how small is it really?

100 grams, 26mm long, 63mm diameter. It's a true pancake-it doesn't add noticeable bulk to compact Micro Four Thirds bodies like the GX7 or GX8.

What do the two aspherical elements do?

Control coma and field curvature at f/1.7. Without them, fast primes this simple tend to show softness and distortion at the edges when wide open. The aspheres keep the image clean across the frame.