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Product Highlights
  • f/1.7 - f/16 Aperture Range
  • 16/11 Elements/Groups
  • 9 Aperture Blades
  • Micro Four Thirds Format
  • 77mm Filter Diameter
  • MFT Mount
Panasonic Leica DG Vario-Summilux 25-50mm f/1.7 ASPH Lens Panasonic Leica DG Vario-Summilux 25-50m...
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Leica DG Vario-Summilux 25-50mm / f1.7 ASPH

The World’s First Telephoto Zoom Lens Achieving Full-range f1.7

Panasonic is proud to introduce a new telephoto zoom digital interchangeable lens, the LEICA DG VARIO-SUMMILUX 25-50mm / F1.7 ASPH. (H-X2550), which boasts a large F1.7 aperture throughout the entire 50-100mm (35mm camera equivalent) zoom range with exceptionally high optical performance clearing the stringent LEICA standards. The LEICA DG VARIO-SUMMILUX 25-50mm / F1.7 ASPH. is suitable not only for photo shooting but also for video recording to satisfy both professional photographers and videographers.

Key Features:

  • Leica lens performance for all Lumix Micro Four thirds Camera

    Strict LEICA quality standards now in a F1.7 Micro Four Thirds (MFT) camera lens for professional photographers and videographers

  • Exceptional optical performance across the full zoom range

    Bright F1.7 aperture is available across the entire zoom range of 25-50mm

  • Stepless aperture for smooth, even brightness

    A stepless aperture ring and micro-step drive aperture system ensure optimal, consistent light when zooming or panning

  • Minimize image shifts during zooming

    The optical design achieves exceptional barycentric stability to minimize image shifts during zooming

  • Rugged design

    Dust/splash*/freeze-resistant design withstands heavy field use under harsh conditions

This new LEICA DG VARIO-SUMMILUX 25-50mm / F1.7 ASPH. (H-X2550) has been designed to be a pair with the LEICA DG VARIO-SUMMILUX 10-25mm / F1.7 ASPH. (H-X1025), which is available on the market and has been highly acclaimed by the creators. They both feature the full-range F1.7 high-speed aperture that provides beautiful bokeh. These two lenses cover a focusing distance from wide angle to telephoto, functioning as eight fixed focal length lenses (20mm / 24mm / 28mm / 35mm / 50mm / 75mm / 85mm / 100mm, 35mm camera equivalent) providing the same or an even higher level of detail than a fixed focal length lens can offer. They have a common aperture, high quality performance, shape and operability so that it is easy to make the creator’s own unique image product using these two lenses with minimal workflow.

Comprising 16 elements in 11 groups, the lens system features an aspherical lens and three ED (Extra-low Dispersion) lenses that effectively suppress the axial chromatic aberration and chromatic aberration of magnification. Spherical aberration and distortion are also corrected by the aspherical lenses for stunningly high resolution. The use of aspherical lenses and the optimum design of the lens system results in a compact size and light weight despite its outstanding optical performance.

Compatibility with a maximum 240-fps high-speed sensor drive realizes high-speed, high-precision auto focusing. Notably, the new lens excels in video recording performance. In addition to the silent operation achieved by the inner focus drive system, the stepless aperture ring and micro-step drive system in the aperture control section help the camera to smoothly catch up to brightness changes when zooming or panning. The optical design achieves exceptional barycentric stability to minimize image shifts during zooming. A focus ring is equipped for intuitive, precise focusing and linear/ non-linear setting can also be switched with this ring. The LEICA DG VARIO-SUMMILUX 25-50mm / F1.7 ASPH. also excels in video recording performance with a mechanism that suppresses focus breathing at entire zoom range. 

The LEICA DG VARIO-SUMMILUX 25-50mm / F1.7 ASPH. boasts minimum focusing distance of 0.28m (at wide end, 0.31m at tele end) and the maximum magnification ratio of 0.42x (35mm camera equivalent) for superior macro photography. The rugged dust/splash-resistant* design can withstand use under harsh conditions even in 10 degrees below zero for high mobility. Filter diameter is in 77mm.

What's Included

DG Vario Summilux 25-50mm f1.7 ASPH
Front Lens Cap
Rear Lens Cap
Lens Hood
Lens Case


Product Specifications

Leica DG Vario Summilux 25-50mm f1.7 ASPH

Optical structure 16 elements in 11 groups (1 aspherical lens, 3 ED lenses, 1 UHR lens)
Bayonet Micro FourThirds Standard
Focal length f = 25–50 mm (equivalent for a 35 mm camera 50–100 mm)
Aperture type 9 aperture blades / circular aperture
Maximum aperture F1.7
Minimal aperture F16

Minimum focus distance

0.28m (28.04cm) (with a focal length of 25mm), 0.31m (31.09cm) (with a focal length of 50mm)
Maximum magnification 0.21x / 0.42x (equivalent with 35 mm camera) (with focal length 50 mm)
Diagonal camera angle 47 ° (wide angle) to 24 ° (telephoto)
Dust and splash-proof Yes

* Protection against dust and splash water does not guarantee that damage will not occur if the lens comes into direct contact with dust or water.
Recommended operating temperature -10 ℃ to 40 ℃ (14 ℉ to 104 ℉)
Filter size φ 77 mm
Max. Diameter φ87.6 mm
Overall length Approx. 127.6mm (12.75cm) (from the top of the lens to the base of the lens mount)
Weight Approx. 654g (without lens cap, rear lens cap and lens hood)

Questions & Answers

Panasonic Leica DG Vario-Summilux 25-50mm f/1.7 ASPH Lens

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