Panasonic Lumix S 20mm f/2.5 - Lens review and specs

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Leica L Prime full-frame 2026

Weather Sealed

Autofocus

Breathing Correction

Full-time Manual Focus

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Useful links

Official Website

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Compare with

20mm

Focal length

f/2.5

Max aperture

142 g

Weight

14mm35mm85mm200mm600mm

▲ 20mm

Max aperture

f/1.8

f/2.5

f/5.6

Constant Aperture

Aperturef/2.5

f/2.5f/22

Near focus3' 0"

Far focus4' 5"

Total DOF1' 5"

Hyperfocal18' 3"

Subject distance3' 7"

Focal length20 mm

Aperturef/2.5

SensorFull Frame

Illustrative scene preview based on this lens's focal length, aperture, and sensor coverage.

This preview uses 20mm, f/2.5, and Full Frame. Subject distance is estimated to keep lens previews comparable.

Min aperture: f/22
Diaphragm blades: 7

Optics

Optical construction: 11 elements in 9 groups
Special elements: 3 Aspherical, 3 ED elements, Fluorine coating
Coatings: Fluorine front coating

Focusing

Minimum focus: 18 cm
Max magnification: 0.15×
AF motor: STM

Physical

Weight: 142 g
Dimensions: ⌀69mm × 41mm
Filter thread: 62 mm
Color: Black

Handling & Controls

Custom Buttons: 1

Recommended Use

Ideal for: Architecture, Landscapes, Street, Travel, Vlogging, Walkaround / Daily

Release year: 2026
Announced: Sep 16, 2026
Approx price: $499 USD

The best

Ultra-compact 142g 20mm full-frame prime for L-Mount.

Also

Bright f/2.5 aperture with 11 elements in 9 groups and weather sealing.

Summary

The Panasonic Lumix S 20mm f/2.5 from Panasonic is an ultra-compact and remarkably lightweight full-frame wide-angle prime lens engineered for L-Mount mirrorless systems. Featuring a versatile 20mm ultra-wide focal length and a bright f/2.5 maximum aperture, it offers an expansive field of view tailored for landscape photography, grand architecture, real estate interiors, travel documentary, and handheld vlogging. Its sleek, low-profile footprint balances seamlessly with compact full-frame bodies like the Lumix S9, enabling creators to shoot discreetly throughout the day without fatigue.

The sophisticated optical layout comprises 11 elements arranged in 9 groups, featuring 3 aspherical elements and 3 extra-low dispersion (ED) elements to counteract chromatic aberrations, coma, and distortion. This delivers exceptional edge-to-edge resolution and high contrast even when shooting wide open at f/2.5. A 7-blade circular diaphragm yields smooth, pleasing background blur and natural out-of-focus highlights. Weighing only 142g with a length of 41mm and a standard 62mm filter thread, the lens is engineered for rugged outdoor use with complete dust, splash, and freeze resistance alongside a protective fluorine front coating.

Autofocus is driven by a rapid and whisper-quiet stepping motor (STM) with an internal focusing mechanism that eliminates barrel extension and suppresses focus breathing for seamless video recording. A short minimum focusing distance of 180mm (0.18m) allows dynamic wide-angle close-ups with a 0.15x magnification ratio. With a tactile physical AF/MF switch and a programmable Fn button on the barrel, the Panasonic Lumix S 20mm f/2.5 delivers reliable control and superior imaging in an exceptionally portable form factor.

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Where to buy

Amazon USAView offers B&H PhotoView product

Some links may be affiliate links (sponsored).

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Pros & Cons

Pros

Bright f/2.5 maximum aperture in a compact pancake-style body (41mm length)
Ultra-wide 20mm perspective weighing just 142g ideal for gimbals and vlogging
Dust, splash, and freeze-resistant weather sealing with fluorine front coating
Advanced optics with 11 elements in 9 groups including 3 ED and 3 aspherical elements
Dedicated physical AF/MF switch and customizable Fn button