AmScope B690 Series Binocular Compound Microscope with Koehler Illumination

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The B690 is designed for professional biological applications. Its infinity-corrected optical system ensures reliable, low-distortion magnification, with achromatic corrections for accurate colors and improved sharpness. The halogen illumination system provides low-fatigue, evenly-distributed light for maximum contrast and definition. This model is a popular choice for veterinarians and university laboratories. To customize the microscope to your viewing comfort, the eyepiece spacing can be easily adjusted using a precision Siedentopf mechanism. A diopter is available on the left ocular tube to compensate for asymmetry, and the ocular tubes are angled at 30° to comfortably accommodate a seated position without neck strain. The objective turret provides instant access to 4 magnification levels to easily focus in on minute details from 40X to 1000X. This covers magnifications needed for studying hair follicles, cells, soil, and bacteria. The turret's reversed orientation provides more working room above the stage. These high-quality lenses are achromatically corrected to improve resolution and color accuracy. The large 2-layer mechanical stage provides smooth and precise movement for examination of specimen slides. The stage's low-position controls are conveniently placed near the coaxial focus knobs for a streamlined workflow. Examining specimen slides is intuitive and precise for users at any skill level. Built on Koehler illumination principals, the sub-stage lighting provides evenly-distributed light for optimal contrast. The halogen light-source provides bright illumination with a lower color-temperature for decreased fatigue when used for long periods. The Abbe light condenser has a high 1.25 numerical aperture for oil-immersion, and an iris diaphragm to optimize contrast and depth-of-field. The condenser holder uses rack-and-pinion height adjustment for precision control, and is centerable for proper alignment. The illuminator's field lens provides an iris diaphragm to control light-spread, optimizing contrast and definition in specimen features. Specifications Optical System Infinite-conjugate Head Binocular, 30° incline, 360° rotatable Interpupillary Adjustment Siedentopf compensation-free gemel, 55-75mm Ocular Diameter 30mm Ocular Diopters left ocular Eyepieces 10X Objective Lenses Infinity-corrected Objective Parfocal Distance 45mm Objective Mounting Thread RMS 20.32mm Objective Turret Reverse quadruple, ball-bearing movement Focusing System Coaxial coarse and fine focus, tension control Division of Fine Focus 0.002mm Stage Design Double-layer with caliper Stage Dimensions 180mm x 150mm X-Y Translation Range 75mm x 50mm Transmitted Illumination 12V/20W halogen Condenser NA1.25 Abbe condenser with iris diaphragm Sub-stage Condenser-holder rack and pinion Power 85-230VAC 50/60Hz wide-band Objective Lenses Magnification Corrections NA Immersion Medium Cover-glass Thickness 4X achromatic 0.10 — 0.17mm 10X achromatic 0.25 — 0.17mm 40X achromatic 0.65 — 0.17mm 100X achromatic 1.25 oil 0.17mm Packing List:One binocular head One microscope body Four objective lenses: 4X, 10X, 40X, 100X One pair 10X eyepieces Three color filters One spare halogen bulb One spare fuse One power cord (US and Canada standard) One dust cover One sample immersion oil Show more