Yongnuo Digital YN 42.5mm f/1.7 M II Autofocus Lens for MFT (Micro Four Thirds), Black Review

The Yongnuo YN 42.5mm f/1.7 M II is a budget autofocus prime for Micro Four Thirds cameras, offering an 85mm full-frame equivalent focal length ideal for portraits and everyday shooting. At $99, it undercuts most competing fast primes by a wide margin, making it an attractive option for cost-conscious shooters looking to add a versatile telephoto lens to their kit. Yongnuo's second iteration of this focal length brings autofocus to the platform, a feature often reserved for pricier glass in the MFT ecosystem.

The f/1.7 maximum aperture provides enough speed for shallow depth of field and decent low-light performance, though it won't match the f/1.2 or f/1.4 options from Olympus or Panasonic. The 52mm filter thread is standard and convenient. This lens targets hobbyists and beginners who want a capable portrait prime without the premium price tag of first-party options.