Christopher,Originally Posted by CXC
A good way to achieve proper focus in these conditions, is to rack the focusing back and forth until you DO notice that it's obviously gone out of focus. Since the depth of focus is symetrical (for all practical purposes) you can just make a mental note of where it goes soft(er) in each direction, then set the focus midway between those extremes. Also, as someone mentioned as higher powered loupe may help somewhat.
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