It is the first knob you should turn to bring the object into rough focus, before tinkering with the finer tuning knobs.
it is the course focus
meri potti
This is the coarse adjustment knob. This should be used before the fine adjustment knob (the smaller knob) - which is for fine focusing.
it is the COURSE adjustment knob
The coarse-adjustment knob moves the body tube up and down to allow focusing of the image.
fine adjustment knob
Focusing, its called a focusing knob.
The small knob is called the fine focus knob, and the big knob is called the coarse focus knob on a microscope. The fine focus knob is used for precise focusing, while the coarse focus knob is used for initial focusing.
The fine adjustment knob on a microscope is typically located on one side of the base near the coarse adjustment knob. It is used to make precise focusing adjustments when viewing a specimen under high magnification.
The course adjustment knob raises and lowers the stage of the microscope. This knob is mainly used on the scanning and low power knob to simply find the specimen. When trying to focus directly, use the fine adjustment knob.
Nosepiece
The stage of the microscope, where the specimen is placed, does not move when the adjustment knob is turned. Instead, the focus of the microscope is adjusted by moving the stage up and down by use of the adjustment knob.
The big knob on a microscope is typically called the coarse focus knob. This knob is used to move the objective lenses closer to or further away from the specimen, allowing for rough adjustment of the focus.
The larger knob used for focusing on a microscope is called the coarse focus knob. It is used to make rapid adjustments to bring the specimen into view.
Condenser focus
focus
it is the course focus