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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.

$1,739.95*
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*Price sourced from Amazon.com. Last updated:Jun 21, 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.

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

Pros & Cons

👍 Pros

  • Constant F1.7 aperture across the full zoom range eliminates the need to carry multiple fast prime lenses.
  • Covers 20-50mm equivalent, spanning ultra-wide to standard focal lengths in a single lens.
  • Fast aperture enables shallow depth of field and strong low-light performance unusual for a zoom.
  • No exposure shift when zooming, making it exceptionally practical for video shooters.
  • Leica DG branding reflects Leica-certified optical design and build quality standards.

👎 Cons

  • Premium pricing places it well above most Micro Four Thirds zoom lenses.
  • Heavier and larger than typical MFT standard zooms due to the fast F1.7 optics throughout.
  • 10-25mm range stops at 50mm equivalent on the long end, so it does not cover portrait or telephoto focal lengths.
  • Micro Four Thirds mount only — not usable on full-frame or APS-C camera systems without adapters and crop penalty.

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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