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Silver Micro Four Thirds zoom lens with textured focus ring and aperture markings

Panasonic

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

SKU CH-QTMC-A5984

Micro Four Thirds zoom with constant f/1.7 aperture, 17 elements in 12 groups, and 240 fps autofocus drive

  • TypeZoom Lens
  • CompatibilityMirrorless Camera
  • Bright F1.7 aperture throughout the 25-50mm zoom range for consistent low-light exposure
  • Leica-certified optics with 17 elements in 12 groups deliver professional image quality
  • Stepless aperture ring with micro-step drive enables smooth brightness transitions during video
  • Inner focus system provides fast, silent 240-fps autofocus for stills and movies
  • Dust, splash and freeze-resistant construction withstands demanding field conditions

Leica DG Vario-Summilux f/1.7 Zoom

The Panasonic Lumix Leica DG Vario-Summilux 25-50mm f/1.7 ASPH is a bright constant-aperture zoom built for Micro Four Thirds mirrorless cameras. It targets professional photographers and videographers who need consistent exposure and Leica-certified optical quality across the entire focal range. The lens combines 17 elements in 12 groups with three aspherical and four ED lenses to suppress aberrations and deliver high resolution.

Upgrade from variable-aperture zooms

This lens replaces slower variable-aperture zooms that lose light at the telephoto end, forcing higher ISO or slower shutter speeds. The jump is worth it for shooters who work in changing light and need the same f/1.7 brightness at 50 mm as at 25 mm. It also suits creators who rely on silent, stepless aperture control for smooth exposure transitions during video recording.

Micro Four Thirds mount with inner focus

Installation is a direct mount onto any Micro Four Thirds body; the inner focus system keeps the lens length constant and the front element stationary for easy filter use. The 240-fps sensor drive enables fast, precise autofocus, while dust, splash and freeze resistance supports heavy field use. Buyers who need a wider angle than 25 mm or a different mount system cannot use this lens.

Highlights

  • Bright F1.7 aperture throughout the 25-50mm zoom range for consistent low-light exposure
  • Leica-certified optics with 17 elements in 12 groups deliver professional image quality
  • Stepless aperture ring with micro-step drive enables smooth brightness transitions during video
  • Inner focus system provides fast, silent 240-fps autofocus for stills and movies
  • Dust, splash and freeze-resistant construction withstands demanding field conditions

Specifications

TypeZoom Lens
CompatibilityMirrorless Camera
BrandPanasonic

Questions about this item

Does the 25-50mm f/1.7 lens mount directly on Micro Four Thirds cameras?

Yes, it uses the native Micro Four Thirds mount so it attaches without adapters to any MFT mirrorless body.

How do I set the aperture ring for video and what mistake should I avoid?

Switch the aperture ring to the stepless position and let the micro-step drive control iris changes; the common error is leaving the ring in clicked stills mode, which causes visible exposure steps while recording.

What ongoing care does the dust- and splash-resistant construction need?

Wipe the front and rear elements with a clean microfibre cloth after exposure to salt spray or dust, and check the rubber mount gasket for grit before each shoot to maintain the seal.

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