Swift M3-M Use And Care Manual page 6

iris diaphragm is opened too wide. If the image is too dark the iris is
not open wide enough.
NOSEPIECE – the revolving turret that holds the objective lenses.
Changes in magnification are accomplished by rotating different
powered objective lenses into the optical path. The nosepiece must
"click" into place for the objectives to be in proper alignment.
OBJECTIVES – the optical systems which magnify the primary image of
the instrument. Microscopic magnifications are 4X, 10X, 40X. The
macroscopic magnification is 1X. The magnification of the objective
combined with the magnification of the eyepiece gives a total 10X
macroscopic magnification of the subject, and allows for total
microscopic magnifications of 40X, 100X and 400X.
SIEDENTOPF (M3-B & M3-F only) – a binocular head design where the
interpupillary adjustment (increasing or decreasing the distance between
the eyepieces) is achieved by pivoting the eyepiece tubes in an up and
down arc motion similar to binoculars.
STAGE RING – the circular ring located in the center of the
microscope that supports the stage plate, black/white contrast
plate, or specimen cup. These components are held onto the stage
ring with a thumbscrew.
Other Important Terminology
"COATED" LENS – in attempting to transmit light through glass, much
of the light is lost through reflection. Coating a lens increases the
light transmission by reducing or eliminating reflection, thus allowing
more light to pass through.
COVER SLIP – thin glass cut in circles, rectangles or squares
usually a thickness of 0.15 to 0.17mm, for covering the slide specimen.
The majority of specimens should be protected by a cover glass, and
must be covered when using 40XRD objective.
DEPTH OF FOCUS – the ability of a lens to furnish a distinct image
above and below the focal plane. Depth of focus decreases with the
increase of numerical aperture or with the increase of magnification.
DIN – (Deutsche Industrie Normen) A German standard for the
manufacturing of microscope lenses. DIN is not a quality standard, but
one of commonality.
EYE POINT or EYE RELIEF – the distance from the eyepiece lens to
your eye where a full field of view can be seen. A higher eye point
accommodates users who wear eyeglasses
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