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This is an upgraded B690-PL which includes a turret phase-contrast system for live-cell analysis among other things. Designed for professional biological applications, the microscope's infinity-corrected optical system ensures reliable, low-distortion magnification, with plan-achromatic corrections for accurate colors, excellent field flatness and edge-to-edge 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, 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, with planatic flat-field correction to provide edge-to-edge sharpness.

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.

A phase-contrast kit is included with a turret condenser and 4 plan-achromatic phase-contrast objective lenses. Phase contrast is used to reveal detail in indistinct objects, such as unstained cells and microorganisms that would otherwise appear invisible. By using a combination of specialized objective lenses and a modified light condenser, these invisible objects can be visualized by manipulating variations in phase. This turret condenser allows you to easily rotate through the four phase-contrast settings (4X, 10X, 40X, 100X). Each phase-contrast setting has a centerable annulus for proper alignment. Each of the phase-ring equipped objective lenses has plan-achromatic corrections for improved color and resolution, as well as edge-to-edge sharpness.

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
NA1.25 phase-contrast turret
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 plan-achromatic 0.10 0.17mm
10X plan-achromatic 0.25 0.17mm
40X plan-achromatic 0.65 0.17mm
100X plan-achromatic 1.25 oil 0.17mm
4X Plan-achromatic
Phase contrast
0.10 0.17mm
10X Plan-achromatic
Phase contrast
0.25 0.17mm
40X Plan-achromatic
Phase contrast
0.65 0.17mm
100X Plan-achromatic
Phase contrast
1.25 oil 0.17mm

Packing List:

  • One binocular head
  • One microscope body
  • Four objective lenses: 4X, 10X, 40X, 100X
  • One pair 10X eyepieces
  • One phase contrast kit:
  • -- Four phase-contrast objective lenses: 4X, 10X, 40X, 100X
  • -- One turret condenser
  • -- One centering eyepiece
  • -- One color filter
  • -- One aluminum case
  • Three color filters
  • One spare halogen bulb
  • One spare fuse
  • One power cord (US and Canada standard)
  • One dust cover
  • One sample immersion oil
  • AmScope B690 Series Koehler Phase-contrast Binocular Compound Microscope with Plan Optics and Optional Camera
    • 40X1000X
    • 40X1500X
    • 40X2000X
    • 40X2500X
    • noneselected
    • MiniUSB
    • USB20
    • USB30

    $ 89.02

    $ 68.48

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