TRINOCULAR OBSERVATION HEADSiedentopf observation head inclined at 30° rotatable at 360°.Diopter adjustment ring on ocular tube. Interpupillary distance from 55mm to 75mm. EYEPIECEWide field eyepiece 10X (Paired) FOV 18mmOBJECTIVES(finite)M Plan Achromatic 5XM Plan Achromatic 10XM Plan Achromatic 20XM Plan Achromatic 50X ( S L)MECHANICAL BODY a) Co-axial focusing system with large knobs, PRE-FOCUSING LEVER & TENSION ADJUSTMENT RING.b) Quadruple nosepiece on ball bearing.c) Mechanical stage is 125mmX130mm and have co-axial controls on ball bearing guide ways.ILLUMINATORThe Epi illuminator has 6V-20W halogen lamp with intensity control knob.STANDARD ACCESSORIES6V/20W Halogen tungsten bulb.STYRO FOAM molded pack.