Specifications: Body: Trinocular. Eyepiece: 15 times wide field inclined at 45 degrees. Magnification: 21x to 135x, maximum 180x with 20x eyepieces. Working distance: 84mm. Interpupillary distance: 50 mm. up to 74mm. Dioptre adjustment: +5.6D-7.2D in both eyepieces. Trinocular port: easy to adjust fine focus with a single touch. Optical system: Greenough.