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Yongnuo YN85mm F1.8R DF DSM second generation autofocus lens introduced for Canon RF

YN85mm F1.8R DF DSM second generation autofocus lens
YN85mm F1.8R DF DSM second generation autofocus lens

The YN85mm F1.8R DF DSM , a second-generation autofocus full-frame RF-mount lens from Yongnuo , has been officially launched . Previously, it was presented for Sony E and Nikon Z mounts. This is actually the only (along with the first generation) RF lens from a third-party manufacturer. Of course, the lens was produced without the approval of the copyright holder, despite Viltrox’s problems  with Canon last year due to the release of Viltrox AF 85mm F1.8 RF STM , Yongnuo made it and is ready to sell it.

This is a fairly compact and fast telephoto lens with a fixed focal length of 85 mm (136 mm for APS-C cameras). The optical design features nine elements in eight groups, including one low dispersion element to reduce chromatic aberration and color fringing, a high refractive index element to reduce spherical aberration and distortion, and a multi-layer nanocoating on the lenses to suppress flare and ghosting and enhance contrast in strong lighting conditions. The autofocus is driven by a DSM stepper motor, which provides fast and quiet focusing, suitable for both photo and video shooting.

The lens design has an adjustable ring, a USB port for easy settings, and an AF/MF switch. Metal bayonet connection with gold-plated contacts and rubber seal for protection against dust and moisture.

The manufacturer promises that the new YN85mm F1.8R DF DSM is fully compatible with all modern cameras in the EOS R line.

Optical design

MTF Charts

Specification of the second generation Yongnuo YN85mm F1.8R DF DSM lens

  • Sensor format: full frame
  • Optical design: 9 elements in 8 groups
  • Aperture range: f/1.8–f/16
  • Aperture: 7-blade
  • Viewing angle: 28.83° (diagonal), 16.5° (vertical), 24.12° (horizontal)
  • Maximum magnification: 0.13x
  • Customizable ring
  • USB port
  • Thread diameter for filter: 58 mm
  • Minimum focusing distance: 0.8 m.
  • Dimensions: Ø69 x 86 mm
  • Weight: 381 g


The lens is already available for pre-order on the manufacturer’s website at a price of 2599 yuan (~$364), as well as on B&H. Sales are due to begin in January 2024.

Note that the price for RF optics is very attractive, but it would be interesting to understand how well the autofocus works, and whether there will be any reaction from Canon to this.

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