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Panasonic Lumix S 18-40mm f/4.5-6.3 specifications and in-depth review

Panasonic Lumix S 18-40mm f/4.5-6.3

Manufacturer: Panasonic

The Panasonic Lumix S 18-40mm f/4.5-6.3 is a compact zoom lens designed for the Leica L mount system. Tipping the scales at just 155g, it offers a practical focal range for everyday shooting situations. One of its notable construction details is its metal mount, which contributes to build reliability, alongside full weather sealing that provides splash resistance in varied shooting conditions.

Optically, the lens covers an 18–40mm range, translating to a maximum angle of view of 100° and a minimum of 57°, with an optical zoom ratio of 2.2x and a magnification of 0.28x. The maximum aperture varies from f/4.5 at the wide end to f/6.3 at the telephoto end, while the minimum aperture reaches f/22 and f/32 respectively. The aperture mechanism uses seven rounded blades for smoother out-of-focus rendering. On the focus side, the lens includes a silent built-in focus motor, supports infinity focus, and is capable of focusing as close as 0.15m. There is no built-in optical image stabilization.

Pros
  • Weather sealing provides splash resistance for use in damp or unpredictable conditions
  • The built-in silent focus motor keeps autofocus noise inaudible, making it suitable for video work
  • A minimum focus distance of 0.15m allows the lens to get quite close to subjects
  • Metal mount construction adds durability to the connection between lens and camera body
  • Seven rounded aperture blades help produce smoother out-of-focus areas in images
  • At 155g, the lens is light enough to keep the overall camera kit easy to carry for extended periods
Cons
  • No built-in optical image stabilization, leaving users reliant on in-body stabilization if available
  • The maximum aperture narrows to f/6.3 at the telephoto end, limiting light intake in longer focal length shots
  • The 2.2x optical zoom range is relatively modest, restricting compositional flexibility without physically moving
Who is this for?

This lens is a good fit for photographers who prioritize a lightweight and portable kit for everyday or travel use, given its 155g build and compact zoom range. The weather sealing makes it a practical choice for shooting in changeable outdoor conditions where splash resistance is useful. Its silent autofocus motor and close minimum focus distance of 0.15m also make it well-suited for hybrid shooters who regularly switch between stills and video, particularly in quieter environments where focus noise would be noticeable.

Who is this NOT for?

Users who frequently shoot in low-light or indoor environments may find the variable aperture range of f/4.5–6.3 limiting, as the lens lets in a relatively modest amount of light, especially at the longer end. Those needing optical image stabilization directly in the lens will also find this model lacking, which can be a drawback for handheld shooting if the paired camera body does not offer its own stabilization system. Additionally, photographers who require a wide or versatile zoom range for distant subjects or tightly framed compositions may find the 2.2x optical zoom and 40mm maximum focal length too restrictive for their needs.

General info:

lens type Zoom
lens mount Leica L
is weather-sealed (splashproof) ✓
Has a metal mount ✓
weight 155 g
filter size 62 mm

The Panasonic Lumix S 18-40mm is a zoom lens built around the Leica L mount, making it compatible with cameras that use this system. It has a relatively lightweight build at 155g and accepts filters via a 62mm thread. The lens features a metal mount for added durability, and it carries weather sealing that offers splash resistance against the elements.

Optics:

maximum focal length 40 mm
minimum focal length 18 mm
has built-in optical image stabilization ✕
maximum angle of view 100°
minimum angle of view 57°
magnification 0.28x
optical zoom 2.2x

This lens covers a focal range of 18–40mm, delivering a maximum angle of view of 100° at the wide end and narrowing to 57° at the telephoto end, with an optical zoom ratio of 2.2x. It achieves a magnification of 0.28x, making it capable of rendering moderately close subjects with reasonable detail. There is no built-in optical image stabilization, so any such compensation would need to come from the camera body itself.

Aperture:

wide aperture (main camera) 4.5f
widest aperture at maximum focal length 6.3f
aperture blades 7
Has rounded aperture blades ✓
smallest aperture at maximum focal length 32f
smallest aperture at minimum focal length 22f

The lens has a variable maximum aperture, opening to f/4.5 at the wide end and f/6.3 at the longest focal length. On the other end of the range, the smallest available aperture is f/22 at 18mm and f/32 at 40mm. The aperture mechanism is built around 7 rounded blades, which helps produce smoother circular out-of-focus highlights across the frame.

Focus:

Can focus to infinity ✓
Has focus motor ✓
has a silent focus motor built into the lens ✓
minimum focus distance 0.15 m

The lens includes a built-in focus motor that operates silently, making it well-suited for video recording or any situation where audible focusing noise would be disruptive. It supports the full focus range from a minimum focus distance of 0.15m all the way out to infinity. This combination of a quiet internal motor and broad focusing range gives the lens a versatile and self-contained autofocus setup.

Benchmarks:

Final Verdict

The Panasonic Lumix S 18-40mm f/4.5-6.3 is a compact, lightweight zoom lens that makes a clear case for itself as a practical everyday option within the Leica L mount system. Its weather-sealed metal construction and silent built-in autofocus motor give it a level of build quality and operational versatility that suits both still photographers and video-oriented shooters. That said, the variable aperture and absence of optical image stabilization mean it performs best when paired with a stabilized camera body or used in well-lit conditions. For those seeking a light, weather-resistant lens for general-purpose use without the bulk of larger zoom options, the Lumix S 18-40mm delivers a focused and coherent feature set that aligns well with its intended audience.

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