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Product: 805685

AmScope B490B-BS-50P-S Compound Binocular Microscope, WF10x and WF20x Eyepieces, 40X-2000X Magnification, Brightfield, Halogen Illumination, Abbe Condenser, Double-Layer Mechanical Stage, Sliding Head, High-Resolution Optics, Anti-Mold, Includes 50 Blank Slides and 100 Coverslips

Product Description

Compound microscope provides high magnification for biological use and educational applications

Binocular viewing head with pairs of 10x widefield and 20x widefield eyepieces and sliding head with 55 to 75mm interpupillary adjustment, fixed 30-degree vertical inclination to reduce eye and neck strain, and 360-degree rotation capability to provide a more comprehensive view and enable sharing

Forward-facing nosepiece with 4x, 10x, 40xS (spring), and 100xS (spring, oil) DIN achromatic precision-ground optical-glass objectives that provide color correction of magnified images, and anti-mold surfaces to preserve optics in high-humidity areas

Brightfield, halogen illumination with rheostat to control light intensity, and 1.25 NA Abbe condenser with iris diaphragm and rack-and-pinion focus control for precise focus, clear examination, and light control

Double-layer mechanical stage with 1.0mm stage divisions and stage stop; and graduated coarse and fine focus with tension control to prevent stage drift

Imported from USA

The AmScope B490B-BS-50P-S compound binocular microscope has a sliding head, interchangeable pairs of 10x widefield and
20x widefield eyepieces, a forward-facing nosepiece with four DIN achromatic objectives, Brightfield halogen
illumination, a double-layer mechanical stage with a stage stop to protect slides and objectives from damage, and
anti-mold surfaces to preserve optics in high-humidity areas. The compensation-free binocular viewing head has
interchangeable pairs of 10x widefield and 20x widefield eyepieces and sliding head to adjust inter-pupillary distance,
a fixed 30-degree vertical inclination to reduce eye and neck strain, and a 360-degree rotation capability to provide a
more comprehensive view and enable sharing. The sliding head has a range of 55 to 75mm to accommodate individual eye
differences, and bi-lateral dioptric adjustment accommodates individual eye-strength differences. The forward-facing
nosepiece has 4x, 10x, 40xS (spring), and 100xS (spring, oil) DIN achromatic optical-glass objectives that combine with
the eyepieces to provide color correction of magnified images. The 40xS objective is spring loaded to prevent slide
damage when focusing. The 100xS spring-loaded oil objective provides increased resolution over a standard objective. A
compound microscope is used for inspection and dissection of specimens when two-dimensional images are desired.

The microscope has lower (transmitted, diascopic) Brightfield illumination that transmits light up through the specimen
for enhanced visibility of translucent and transparent objects. Brightfield (BF) illumination allows the specimen to
absorb light, resulting in a dark image on a light background. Halogen illumination provides bright light in a
concentrated path and has a rheostat to control light intensity. The 1.25 NA Abbe condenser is mounted on a
rack-and-pinion control system, can be adjusted to control the distance of the light from the stage, and has an iris
diaphragm to optimize the amount of light illuminating the specimen. The double-layer mechanical stage, with 1mm stage
divisions, locks the slide into place and provides precise slide manipulation along the X- and Y-axis to allow
coordinates to be recorded, enabling the viewer to return to a specific location on the slide. A stage stop prevents the
stage from coming into contact with the slide and objectives. The stage is 5-1/2 x 5-1/2 inches (140 x 140mm) and has a
traveling range of 2-15/16 x 1-3/4 inches (75 x 45mm). Graduated coaxial coarse and fine focus has a focusing range of
1-3/16" (30mm) and fine-focus divisions of 0.002mm (0.0000787") that enable measurements to be taken. Focus knob tension
control prevents the stage from drifting out of focus. The solid-metal enamel-coated body is durable and resistant to
stains and corrosion.


Compound binocular

WF10x, WF20x

4X, 10x, 40xS, 100xS (oil)

Double-layer Mechanical

Lighting configuration
Transmitted (lower)

1.25 NA Abbe


Light source
Halogen with rheostat, 6V/20W

Illumination type


Overall dimensions
12 x 9 x 16 inches (H x W x D)

H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to
right; D is depth, the horizontal distance from front to back.

Microscopes are instruments used to enhance the resolution of an object or image. Types include compound, stereo, or
digital. Compound microscopes use a compound optical system with an objective lens and an eyepiece. Stereo microscopes
show object depth in a three-dimensional image. Digital microscopes are used to display an image on a monitor, rather
than looking through a lens. Microscopes can have monocular (one), binocular (two), or trinocular (three) eyepieces,
with varying magnification abilities. Magnification ability refers to the size of an image. Resolution, also known as
resolvant power, refers to the clarity of the image. The interaction between field of view (FOV), numerical aperture
(NA), and working distance (WD) determines resolution. Microscopes can control magnification through a fixed focus, or
through a range of adjustments. They can also utilize LED, fluorescent, and mirror light sources to help control viewing
capabilities. Microscopes are widely used in education, lab research, biology, metallurgy, engineering, chemistry,
manufacturing, and in the medical, forensic science, and veterinary industries.

United Scope manufactures microscopy equipment and accessories under the brand name AmScope. The company, founded in
1996, is headquartered in Irvine, CA.

What's in the Box?

* AmScope B490B microscope with double-layer mechanical stage
* 10x widefield eyepieces, one pair
* 20x widefield eyepieces, one pair
* 4x DIN achromatic objective
* 10x DIN achromatic objective
* 40xS DIN achromatic objective
* 100xS (oil) DIN achromatic objective
* Immersion oil, one bottle
* (2) Color filters; blue and green
* (50) Blank slides
* (100) Coverslips
* Spare halogen bulb
* Spare fuse
* Instructions