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The "Rule of 1/3" is a good guideline. In my experience. And don't forget to add in any cover glass on the front of the camera sensor chamber as well. Most cooled cameras have a cover glass. Also remember that Reducer/Correctors are usually measured from a certain point (not necessarily the last glass surface), like the beginning of the threaded section at the rear. Notes with Reducer/Correctors usually advise where to measure from.
For those that love to find fault, note that I am not suggesting you count in the sensor cover glass (bonded to the sensor) as this is usually considered the sensor, and is very thin in any event, like 0.5mm.
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