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Imported from USA.
The National Optical 131 Basic Monocular Compound Microscope has
a 10x widefield eyepiece with pointer, a forward-facing nosepiece
with three DIN achromatic objectives that are parcentered and
parfocal, tungsten illumination, separate coarse and fine focus,
a disc diaphragm, and a plain stage with stage clips. The
monocular viewing head has a fixed inclination to reduce eye and
neck strain, and 360-degree rotation capability to enable
sharing. An eyepiece pointer is used to identify features for
students. A forward-facing nosepiece eases changing objectives.
Rotation positions with secure, positive stops ensure accurate
positioning and support a range of magnification options.
Achromatic objectives provide color correction of magnified
images. Parcentered and parfocal objectives ensure that the image
stays centered and focused when the magnification is changed. The
40xR objective is retractable and spring-loaded to prevent damage
to the slide or objective when focusing. A basic compound
microscope is used in classroom, home school, and hobbyist
settings for inspection and dissection of specimens when
two-dimensional images are desired.
The microscope has lower (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. The tungsten
(incandescent) light source provides bright light. A disc
diaphragm controls the amount of light illuminating the specimen.
The plain stage has an opening for light transmission, stage
clips to secure the slide or specimen in place while viewing, and
pre-drilled holes that accept a mechanical stage (sold
separately). Separate coarse and fine focus knobs speed focusing.
A slip clutch prevents excess pressure from damaging the slides
or objectives, a stage stop prevents the stage or specimen from
coming into contact with the objectives, and a focus tension
control prevents stage drift. The cast metal frame provides
durability and has a gray enamel finish.
Microscope Head and Optics Specifications
Objectives, DIN achromatic, parcentered, parfocal
4x, 10x, 40xR (retractable)
Microscope Illumination and Stage Specifications
Separate coarse and fine
110 x 120mm (W x D)
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
National Optical and Scientific Instruments manufactures
microscopes and microscope cameras. The company, founded in 1991,
is headquartered in Schertz, TX.
What's in the Box?
* National Optical 131 Basic Monocular Compound Microscope
* WF10x eyepiece, 18mm
* 4x DIN achromatic objective
* 10x DIN achromatic objective
* 40xR (retractable) DIN achromatic objective
* Dust cover