- Chromatic Aberration: When lenses fail to focus two different parts of the spectrum in the same focal plane, they suffer from chromatic aberration.
- Condenser: The function of the condenser is to provide full illumination to the specimen place and to enhance the resolution and contracts of the object being viewed.
- DIN Optics: A German Standard for the manufacturing of microscope lenses. Optics are interchangeable from one DIN microscope to another. (DIN: Deutsche Industrial Normen)
- Diopter Adjustment: The ability to adjust the focus for one eyepiece in a binocular or trinocular microscope to compensate for the different in vision between the user's eyes.
- Focal Length: Parallel rays of light after refraction through a lens will be brought to a focus at the focal point. The distance from the optical center of the lens to the focal point, in the focal length, or focus.
- Numerical Aperture (N.A.): A measure of the light gathering capabilities of an objective lens. The concept is comparable to the F-value in photographic lenses. In general, N.A. values less than 1.00 are dry objectives, while values greater than 1.00 require oil as a medium. The N.A. value can be found on individual objectives. NOTE: Condenser lenses are part of the optical system and are also assigned a N.A. value. The condenser system on a scope should match the N.A. of the highest power objective on the microscope.
- Parfocal/Parcenter: A microscope system that is parfocused/parcentered enables the user to switch objective lenses (change powers) and still have the specimen in focus and centered in the field of view.
- Working Distance: The distance between the front lens of the objective and the cover glass when the lens is focused on the specimen.
Wednesday, October 17, 2012
Microscope lingo can have any first-time user or owner confused. Swift has put together a list of basic definitions that will have you understanding your microscope and sounding like a seasoned scientist in no time!