4
MICROSCOPE TERMINOLOGY
• ABBE CONDENSER
: The 1.25 N. A. Abbe condenser lens positioned under center of stage is
requited when using 100x objective lenses. In addition the Abbe condenser is focusable by one
of two methods, a spiral mount condenser with lever to lower or raise the assembly or else a rack
and pinion mount with a knob to provide movement in the up and down direction
• ARM
: Main support for microscope components.
• BASE
: Housing and platform of the instrument to which the arm is attached in addition it usually
contains an illumination system for the microscope.
• BODY TUBE
: On simple vertical tube models it holds the eyepiece tube and objective, on
advanced models it holds nosepiece, objectives and head.
• COAXIAL FOCUSING KNOBS
: Coaxial focusing system combines both the coarse and fine
focus into one set of knobs located on the same axis. The control is designed for a continuous
operation over the range of stage movement.
• COARSE FOCUSING KNOBS
: Large knobs located on each side of arm, raise or lower stage to
bring specimen image into focus.
• CONDENSER LENS (0.65)
: Condenses light rays from sub stage illumination and fills the back
element of objective lens to improve image resolution. A 0.65 condenser lens fixed in center of
stage is provided on microscopes with objectives up to 40x (400 times magnification).
• DIOPTER ADJUSTMENT
: Adjustable eyepiece diopter permits focusing adjustment of image for
any difference in vision between users eyes.
• DISC DIAPHRAGM
: Disc located below stage with holes of various apertures, designed to help
achieve optimum resolution of the objective lens. Larger apertures used for higher magnifications,
and smaller apertures used for lower magnifications.
• EYEPIECE (ocular lens)
: Lens closest to the eye magnifies the primary image formed by the
objective lens.
• EYEPIECE TUBE
: This is the component that holds the eyepieces in place. Elementary, student
and high school models have set screws in the eyepiece tube used to lock eyepieces in place.
• FIELD OF VIEW
: View area that is seen through the lens system of the microscope.
• FILTER
: Daylight blue filter designed to make incandescent illumination appear white.
• FILTER HOLDER
: Attached to bottom of iris diaphragm that swings out allowing user to insert
filter of choice. If a built in neutral filter is provided it should be removed from the optical path
when using 40x and 100x objectives.
• FINE FOCUSING KNOBS
: Smaller knobs, located close to the coarse focusing knobs, permit
more precise adjustment of the image.
• FOCUSING EYEPIECE TUBE BINOCULAR HEAD
: Focusing eyepiece tube models, (two
diopters) used to adjusting parfocality and focusing adjustment of image for any difference in
vision between eyes.
• HEAD
: Upper portion of the microscope which contain prisms and eyepiece tube or tubes.
• INCIDENTAL ILLUMINATION
: Primarily used on stereo type microscopes to provide illumination
from above the specimen.
• INTERPUPILLARY DISTANCE
: Interpupillary distance (IPD) is the distance between the center
of the pupils of the two eyes. Interpupillary distance is critical for the design of binocular viewing
heads so that the left and right image can blend into one image.
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