High class glass with Large size aperture φ150mm are used for all machine types.Lens magnification･･･2×,3×,4×exchangeable.Illumination Iump･･･FCL30W Circular fluorescent lamp.日本OTSUKA大冢放大镜 技术参数：・Aperture lens 150mm・Support 230mm（φ16）・Horizontal bar 140mm（φ13）・Total length 315mm