I purchased a Discovery VT-R 4- 16x40 a fixed focus job direct from the RoC. Its not a patch on other RoC scopes I have, the lenses are fuzzy at their edges and the turrets are crap. Normally I buy Visionking, Vector Optics or Canis Latrans, however, I wanted that particular spec which none of the others did at that time so you live and learn the hard way.