TRINOCULAR OBSERVATION HEADSiedentopf observation head inclined at 30° rotatable at 360°.Diopter adjustment ring on ocular tube. Interpupillary distance from 48mm to 75mm.EYEPIECESEyepiece PWF 10X (Paired) FOV 22mm. Centering Telescope. OBJECTIVES (INFINITE)LWD infinity Plan objective 4X / 0.1 W.D 18mmLWD infinity Plan objective 40X / 0.6 W.D 2.8mm LWD infinity Plan Phase PH 10X/ 0.25 WD 10mmLWD infinity Plan Phase PH 20X/ 0.4 WD 5.1mm MECHANICAL BODY a) Quintuple nosepiece.b) PRE-FOCUSING LEVER & TENSION ADJUSTMENT RING are on focusing mechanism.c) Hard Coated mechanical stage is 200mmX140mm. Movement 30mmX75mm.ILLUMINATOR6V/20W Halogen lamp with a spherical collector lens, continuous regulation of the illumination.CONDENSER Extra long working distance 70mm condenser with N.A. 0.3. field diaphragm, Pull out filter socket.FILTERS Blue , Grey STANDARD ACCESSORIESElectric Cable, Fuse, Vinyl Dust Cover, Operating Manual