TRINOCULAR OBSERVATION HEADSiedentopf observation head inclined at 45o .Diopter adjustment ring on ocular tube.Interpupillary distance from 50mm to 75mm.EYEPIECEWide field eyepiece 10X (Paired) FOV 22mmOBJECTIVES (INFINITY CORRECTED)M - Long Working Distance Plan Achromatic 10X WD 11mmM - Long Working Distance Plan Achromatic 20X WD 9mmM - Long Working Distance Plan Achromatic 50X WD 3.8mmM - Long Working Distance Plan Achromatic 80X ( S L ) DryMECHANICAL BODY a) Co-axial focusing system with large knobs, PRE-FOCUSING LEVER & TENSION ADJUSTMENT RING.b) Reverse Angle quadruple nosepiece on ball bearing.c) Mechanical stage is 242mmX172mm.d)The Mechanical stage has low positioned co-axial controls on ball bearing guide ways. POLARIZING OUTFITAnalyser rotatable 360o. Polarizing & Analyser can be slided in/out of the optical path..ILLUMINATOREpi-Koehler’s illumination. Aperture iris diaphragm and field iris diaphragm 12/30W AC 85-230V. Adjustable brightness. Filter wheel fixed in light path with blue , green & yellow filterSTANDARD ACCESSORIES6V/20W Halogen tungsten bulb. STYRO FOAM molded pack.