A lens design such that specimens that appear centered in the field of view at one magnification level will also appear centered when the magnification level is changed. See also: parfocal Top

A binocular microscope with a third, vertical viewing port. The vertical port can be used with an eyepiece for a second person, such as an instructor, to view the specimen, or it can be used with an a [..]

A compound microscope with one eyepiece. Top

an eyepiece with an achromatic doublet lens designed in such a way that itdoes not have to be limited to viewing only in its center, and the portion of the lens that allows non-distorted viewing is la [..]

a lens that is specially designed and coated to correct for the tendency of light to separate into colors when passing through glass. An achromatic lens corrects this such that colors are more accurat [..]

A compound microscope with two eyepieces viewing down a single optical channel and objective. This is different than a stereo microscope, which has a separate optical channel for each eye.  Top

Also referred to as C/CS-mount, it is a threaded standard developed for mounting a lens to a camera. The mount is most commonly used for video cameras (i.e., CCTV cameras, not camcorders), and is used [..]

A configuration where one knob is centered on top of another. For example, coarse and fine focus may have a larger coarse focus knob with a fine focus knob on top of it (so the center of both knobs is [..]

A microscope with multiple lenses, however this definition describes virtually all modern microscopes. It would typically include multiple user-selectable objective lenses of varying magnifications an [..]

The light rays from the illuminator are condensed and focused through this lens in the center of the stage, providing better image resolution. Top