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Originally Posted by Roy C
Changing the subject slightly but can the experts tell me the difference between the 'focusing distance' and the 'working distance' when using an extention tube.
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Focusing distance is the length from the focal plane (film or sensor) to the subject.
Working distance is the length from the front of the lens to the subject.
The difference is the length of the tube plus the length of the lens which changes with focus (unless it's an internal focus lens). In your example this value is 93mm at min. focus and 85mm at infinity.