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Fluorescent (light source for microscopes) – Source illuminator on some models of
microscopes. At Ken-A-Vision fluorescence illumination is now optional on a
limited number of microscopes. Primary benefit of a fluorescent light source is
that the amount of heat generated by the illuminator is severely reduced from a
traditional incandescent or tungsten filament light.
Fluorescence microscope – Ken-A-Vision does not currently carry any of these
specialized microscopes necessary for detecting organelles that have been marked
with fluorescent dyes for rapid location and identification.
Focus
Auto – see Auto Focus
Coarse/Fine Adjust – see Coarse/Fine Adjust
Manual – see Manual Focus and Quick Focus
Quick Focus – see Quick Focus
Focusing types (on microscopes)
Coaxial Controls – Consists of two knobs where one smaller, knob (fine
adjust) is centered on top of another, larger knob (coarse adjust).
This is a feature of all Ken-A-Vision compound microscopes
except the 1200 series for elementary students.
Singlet Control – one knob does both coarse and fine adjustment.
Excellent for novice and young microscope users.
Rack and Pinion – refers to the interlocking of a series of gears and cams
that allows the coarse and fine adjustment knobs to interact. All Ken-A-
Vision microscopes have a rack and pinion system except the ESH 200.
Focal (focus) distance –
Microscope, focal distance is the space between the end of an objective (lens) and
the surface of the specimen or slide. As magnification increases, focal
distance decreases.
Camera – focal distance is the space between the lens of the camera, and the
surface of the object being converted into an image. With Ken-A-Vision
cameras, as the focal distance decreases, the magnification increases.
Frame - One complete still image of video media. Video media is made up of a series of
frames. Each video frame has two interlaced fields.
Frame rate – (Image rate) - number of times per second the image is refreshed per
second. NTSC has a general frame rate of approximately 30 frames per second
(fps) (actual 29.97). PAL has a frame rate of 25 fps). (See also Video Standards –
NTSC and PAL below)
Freeze – Button found on MVP products and the T-1955 (Network Memory Scope)
which will cause the image to be fixed (not live) until button activated again.
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