I do not believe that you will feel the need for Manual Focus.
There are situations were a locked Focus is desirable. My
Definition of those are when you are moving into the direction of super macro.
An easy way to get around the issue is to use the "back button Focus". I am not sure if the D200 has it, but I would assume.
It is a method in which you deactive the Focus from the Trigger button and activate it on a button reachable from your right hand thumb.
Which button and how to changes from Camera to Camera. This way you can lock your Focus to the desired distance. Then you Focus by moving.
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