Panasonic LUMIX S 18-40mm f/4.5-6.3 Lens (L-Mount)

The Panasonic LUMIX S 18-40mm f/4.5-6.3 Lens (L-Mount) is a full-frame wide-to-normal zoom lens billed as the world’s smallest and lightest zoom lens for AF-compatible interchangeable-lens full-frame mirrorless cameras, designed as a compact, portable companion to Panasonic’s L-mount full-frame system, including the compact LUMIX S9.

Optically, the lens covers an 18-40mm focal range with a variable maximum aperture of f/4.5 at the wide end narrowing to f/6.3 at full telephoto, delivering a diagonal angle of view of 100 degrees at 18mm narrowing to 57 degrees at 40mm. The 8-element, 7-group optical design (excluding one protection element) includes three aspherical elements, two ED (Extra-low Dispersion) elements, and one UHR (Ultra High Refractive index) element, keeping distortion and chromatic aberration well controlled across the entire zoom range while maintaining strong corner-to-corner resolution. A 7-blade circular aperture diaphragm contributes to smooth, natural-looking background rendering.

Autofocus uses a fast, silent focusing motor with internal focusing, and the lens is specifically engineered to suppress focus breathing, helping maintain stable framing during focus pulls, a feature particularly valued by video shooters. A standout feature is the lens’s close-focusing capability, with a minimum focus distance of 0.15m (0.49 ft.) at 18-21mm (extending to 0.35m/1.15 ft. at 40mm), yielding a maximum magnification of 0.28x at 21mm, giving the wide end genuine close-up utility with meaningful background separation at f/4.5.

Build quality includes dust-, splash-, and freeze-resistant construction, rated for operation in temperatures as low as -10°C (14°F), along with a fluorine coating on the front element to resist dirt and oil. Despite being an extending lens, it measures just 40.9mm (1.61 in.) in length when retracted and 67.9mm (2.67 in.) in diameter, weighing approximately 155g (0.34 lb.), genuinely pocketable for a full-frame zoom. The lens accepts a 62mm filter thread, with an aperture range of f/4.5-6.3 down to f/22-32.

As a full-frame L-mount lens, it delivers its full angle of view on full-frame L-mount bodies from Panasonic, Leica, and Sigma, and when paired with Panasonic’s LUMIX S9 Hybrid Zoom function, can achieve an effective combined zoom range of 18-120mm.

Key Features
– 18-40mm wide-to-normal zoom for full-frame L-mount
– World’s smallest and lightest AF full-frame zoom lens (as of October 2024)
– Maximum aperture f/4.5-6.3 (variable)
– 8 elements in 7 groups, including 3 aspherical, 2 ED, and 1 UHR element
– Fast, silent internal autofocus motor with focus breathing suppression
– 7-blade circular aperture diaphragm
– Minimum focus distance of 0.15m (0.49 ft.) at 18-21mm; 0.28x maximum magnification
– Dust-, splash-, and freeze-resistant construction (to -10°C/14°F)
– Fluorine-coated front element
– Extremely compact and lightweight (40.9mm length, approximately 155g)
– 62mm filter thread
– No optical image stabilization
– 18-120mm effective range with LUMIX S9 Hybrid Zoom
– Compatible with full-frame L-mount cameras (Panasonic, Leica, Sigma)