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CoreScope – The proper name of our T-1200 series of microscopes both non-digital and
digital. These microscopes are designed primarily for use in Elementary and
Middle School, and have a Singlet (see Coarse/Fine Adjust) knob for focus
adjustment.
Dark/Bright switch – (see bright/dark switch)
Depth of field – With video cameras, the depth of field is the area between the nearest
object that is in focus and the furthest object in focus
Diaphragm (Microscopes) - the diaphragm of a microscope regulates the intensity of
light entering through the slide and into the objective lens. Ken-A-Vision
microscopes come with two types of diaphragms.
Disc – Consists of a series (6 or 8) of openings (apertures) of increasing
diameter, located just below the stage.
Iris - A variable, shutter type adjustment which can be set anywhere
from full closed to fully open, allowing a very precise adjustment
to the amount of light entering into the objective lens.
Field – AN iris type light control, located between the light source and the
sub-stage condenser, allowing even greater control of light.
Digital Output – Digital signals are non-continuous, they change in individual steps. They
consist of pulses or digits with discrete levels or values. The value of each pulse is
constant, but there is an abrupt change from one digit to the next. Digital signals
have two amplitude levels called nodes, the values of which are specified as one
of two possibilities such as 1 or 0, high or low, true or false and so on. The signal
emitted by a Ken-A-Vision camera, on a USB cable connected to a computer is a
digital output or signal. (see also Analog output)
Digitize - term used to describe the conversion of an analog video or audio signal into a
digital signal that can be used by a computer.
Dimension(s) (or size) – Refers to the actual physical dimensions of a Ken-A-Vision
product, usually given as length times width times height. For example, a T-1954
microscope is 8.5" x 5" x 14.5" (21.6cm x 12.7cm x 36.8cm)
DIN – (Deutsche Industrie Normen) represents an international standard for microscope
objectives. This standard specifies the exact threading and focal length, and
insures compatibility with lenses from any microscope manufacturer in the world.
Diopter - The purpose of a Diopter is to allow for a difference in eyesight acuity
between two ‘different eyes’. It is present on one eye-tube of all Dual-headed
(see Head) Ken-A-Vision microscopes, one eyepiece of a Ken-A-Vision binocular
microscope (see Head) or on all Ken-A-Vision digital microscopes. The purpose
of a Diopter is to allow compensation of the differences in eyesight between two
users (Dual-headed microscopes), between the two eyes of a single user
(Binocular microscopes) or between the camera and the view seen in the eyepiece
(11 Seiten)
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