This is an exceptionally good as-new manual focus macro lens for the price. It was bought from a site which advertised it as a Viltrox lens, although there is no brand marking. I do not doubt that it is a Viltrox. The focus isn't smooth - there's a slightly ''scratchy'' feel to it - but it doesn't seem to affect the optics. It's probably normal.

Here's what the manufacturer says:

• Magnification range from 0.1x to 2x. Easily alter the magnification ratio without installing any extension tube or teleconverter.
  • Designed also for normal shooting purposes with a 60mm focal length. An all-in-one solution for normal portrait shooting as well as ultra-macro photography.
• The optical system consists of 2 major moving lens groups to minimize barrel distortion.
• 14 aperture blades form a close-to-circular aperture.
• Metal construction for durability.

  Focal Length: 60mm Maximum Aperture: F/2.8 Angle of View: 25.3 degrees Frame size: APS-C Lens Structure: 9 elements in 7 groups Aperture Blades: 14 Min. Aperture Size: 22 Min. shooting distance: 18.5cm Max. magnification Ratio: 2x Focus: Manual Filter Size: 62mm Lens size: 95x70mm Weight: 672g .