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Yongnuo 25mm f/1.7 ASPH lens announced for Micro Four Thirds mount

Yongnuo micro four thirds lens
(Image credit: Yongnuo)

Do you need a standard focal length for your Micro Four Thirds camera? Yongnuo has just announced the Yongnuo 25mm f/1.7 ASPH lens for the Micro Four Thirds mount. This new lens contains an aspherical element, which makes lenses more effective in how they manage light and aberrations. 

This is the first time that Yongnuo has produced an ASPH lens. This means that it should be better at handling chromatic aberration, which is the color fringing that can appear in the high contrast areas of an image. 

• Read more: Best Panasonic cameras

As reported by (opens in new tab) Photo Rumors, the minimum focus distance of this lens is 20cm, which will give the user plenty of flexibility when it comes to shooting their subject, enabling a shallower depth of field and a closer view. The fact that you can get so close to your subject could also help you produce some macro images - although the maximum reproduction ratio available with the lens is only 1:5. 

Interestingly, Panasonic does currently produce a 25mm f/1.7 ASPH lens for Micro Four Thirds cameras, which is smaller (and possibly lighter) than the Yongnuo option. While no pricing information has yet been released for the Yongnuo lens, we assume that this is where the lens will prove competitive, as most of Yonguo's lenses are far less expensive than competing alternatives. 

Key specifications

  • For Micro 4/3 system
  • Maximum aperture: f/1.7
  • Minimum aperture: f/22
  • Focal length: 25mm
  • Minimum focus distance: 20cm
  • Maximum magnification ratio 1: 5
  • Optical design: 7 elements in 6 groups, the design includes 2 ED elements and 1 aspherical element
  • Automatic focusing by STM motor (focus stepping motor)
  • Aperture: 7 rounded blades
  • AF / MF focus mode switch
  • Filter Diameter: 52mm

Read more: 

Panasonic GH5s review (opens in new tab)
The best Micro Four Thirds lenses in 2020 (opens in new tab)
The best 4K camera for filmmaking (opens in new tab)
The best camera for film students (opens in new tab)

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Usman is a commercial and architectural photographer based in West Yorkshire, who has been working professionally for over seven years. He has also spent over four years as a writer for the biggest photography sites in the world, including Staff Writer for Digital Camera World, senior staff writer for FStoppers, and tech writer for Petapixel. 


With a particular interest in technology developments, high-resolution imaging and the high-end cameras, Usman has been on the cutting edge of camera news as well as writing features about medium format systems and global shutters, and has reviewed some of the latest Leica cameras as well as a tripod that’s even taller than Andre the Giant!