microscope focus rack block focusing mount

Focusing holders hold the microscope body and contain the mechanism that raises or lowers the body to focus on the specimen. Complete stands include their own focusing holders. But for other kinds of tasks, however, it may be necessary to mount the microscope body on a boom arm stand or directly onto a machine or some other surface. The focusing holders below offer a range of options for such applications.

coarse and fine focus rack block

Coarse and Fine Focus Block/Holder focus holder with coaxial coarse and fine focus for high magnification applications where precise fine focus adjustment is required. Rack and pinion mount allows smooth, precise focusing over 33mm of travel. Coarse and fine focus mechanism incorporates a slip clutch and tension adjustment.
Focusing holders hold the microscope body and contain the mechanism that raises or lowers the body to focus on the specimen. Complete stands include their own focusing holders. But for other kinds of tasks, however, it may be necessary to mount the microscope body on a boom arm stand or directly onto a machine or some other surface. The focusing holders below offer a range of options for such applications.

coarse focus and fine focus adjustment focusing knob

Coarse vs Fine Adjustment

difference between coarse and fine adjustment is the range that they have. The coarse adjustment covers the entire range from minimum to maximum. In contrast, the fine adjustment only covers a fraction of the entire range. The bare minimum range for the fine adjustment is the discrete step increment of the coarse adjustment, in order to cover the entire range. It can also be larger, depending on the designer of the device.
character:
1.Coarse adjustment has steps in large increments while fine adjustment has steps in much smaller increments
2.Coarse adjustment covers the entire range while fine adjustment only covers a fraction of the entire range

By chutongelec