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Panasonic H-X1025 Leica 10-25mm F1.7 Lens — main product image
Panasonic H-X1025 Leica 10-25mm F1.7 Lens
Panasonic H-X1025 Leica 10-25mm F1.7 Lens
Panasonic H-X1025 Leica 10-25mm F1.7 Lens
Panasonic H-X1025 Leica 10-25mm F1.7 Lens
Panasonic H-X1025 Leica 10-25mm F1.7 Lens
Panasonic H-X1025 Leica 10-25mm F1.7 Lens
Panasonic

Panasonic H-X1025 Leica 10-25mm F1.7 Lens

★★★★★3.4 (17 reviews)

World's first constant F1.7 zoom lens covering 10-25mm, replacing five primes in one weather-sealed Micro Four Thirds package.

$1,997.99*
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*Price sourced from Amazon.com. Last updated:Aug 05, 2026.Price and availability are subject to change.

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Overview

The Panasonic Leica DG Vario-Summilux 10-25mm F1.7 ASPH (H-X1025) holds a unique position in the Micro Four Thirds lens lineup as the world's first zoom lens to maintain an F1.7 maximum aperture across its entire focal range. In practical terms, this single lens replaces the functionality of five fast prime lenses — roughly a 20mm, 24mm, 28mm, 35mm, and 50mm in full-frame equivalent terms — while maintaining the shallow depth-of-field rendering and low-light capability that previously required carrying dedicated primes for each focal length.

For video shooters, the constant aperture is particularly valuable: zooming during a take produces no exposure shift, eliminating a common problem with variable-aperture zoom lenses. The lens uses an internal zoom design, meaning the barrel length does not change as you zoom, which helps with gimbal balancing and rig stability. The Leica DG Vario-Summilux designation indicates that the optical formula has been designed to Leica's standards, and the lens carries the Summilux name reserved for F1.4–F1.7 optics. Built for the Micro Four Thirds mount, it is natively compatible with Panasonic Lumix and Olympus/OM System bodies, taking advantage of the system's compact size advantage while delivering optical performance that rivals much larger full-frame setups in many shooting scenarios.

Key Features

Leica DG vario-summilux – Leica camera ag’s strict quality standards optimized for photo/video has been developed into this ruggedized Mirrorless micro Four Thirds mount lens.

F1.7 full range – F.17 high-speed aperture brightness is available across the entire zoom range of 10-25mm

Stepless aperture – a stepless “De-Clicked” aperture ring and micro-step Drive aperture system provide smooth transitions when scene brightness changes rapidly.

Clutch focus –a focus Clutch Mechanism enables instant AF/MF switching and accurate manual focusing Plus an inner focus Drive system provides near silent operation.

Specifications

Brand
Panasonic
Model
H-X1025
Lens Name
Leica DG Vario-Summilux 10-25mm F1.7 ASPH.
Mount
Micro Four Thirds
Focal Length
10-25mm (20-50mm equivalent)
Maximum Aperture
F1.7 (constant across zoom range)
Lens Type
Large-Diameter Standard Zoom

Frequently Asked Questions

On Micro Four Thirds cameras, the 10-25mm focal length translates to a 20-50mm equivalent, covering ultra-wide to standard perspectives.
No. This lens maintains a constant F1.7 maximum aperture across the entire 10-25mm zoom range, which is its defining feature and a first for a zoom lens of this type.
The product description identifies it as a professional-grade Leica DG lens. Panasonic's Leica DG lenses in this class are typically splash, dust, and freeze resistant, but check Panasonic's specifications for the H-X1025 to confirm the specific rating.
It uses the Micro Four Thirds mount, making it compatible with Panasonic Lumix and Olympus (OM System) Micro Four Thirds camera bodies.
Yes. The constant F1.7 aperture means no exposure shifts while zooming, and the smooth zoom ring design makes it well-suited for video production where mid-shot focal length changes are common.

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