|MadSci Network: General Biology|
The role of fine adjustment is to move the Objective lense with a finer movements. The object under observation is brought to the focus by adjusting the distance between the Objective lens and the object. While using higher magnifications, it is this distance is very critical and slight variation makes the image out of focus. Hence, it is very difficult to adjust the distance or in other words 'focus the image' using course focus. The fine adjustment option moves the Objective lens to very less distances per turn of the knob allowing the user to bring the object into the focus. Apart form the fine adjustment, which moves only the objective lens, it is also sometimes necessary to adjust Concensor light source to get better contrast. Also, good microscopes are equipped with eye distance and eye balance adjustments to suit individual eye sights.
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