Illustrated in Figure 1 is a modern microscope eyepiece (often termed an ocular) equipped with an internal reticle scale. Horizontal distances below 0.2 micrometers are beneath the resolving power of the microscope, and lengths larger than the field of view of a widefield eyepiece are usually (and far more conveniently) measured with a stereomicroscope A majority of measurements made with compound microscopes fall into the size range of 0.2 micrometers to 25 millimeters (the average field diameter of widefield eyepieces). Alternative mechanisms for performing measurements at high magnifications in compound optical microscopy must be employed, and the most common of these is the application of eyepiece reticles in combination with stage micrometers. This basic principle is applicable to the measurement of specimens observed in the microscope, but in practice, it is often not possible with a compound microscope to place a ruler in direct contact with the specimen (although this is often done in low-magnification stereomicroscopy).
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