Another forum member and I both measured tube length before - they match. Model S and Labophot has the same (or almost the same) tube length, by the way. The S type has focus adjustment in the head, while the Labophot one does not (since CFW eyepieces has some focus adjustment, while mode S' HKWs do not). I am currently using a Nikon model S mono head and a Labophot teaching head for my sons and photography I also have a model S teaching cube (prism), which I bought for about $50 IIRC. So it becomes 6x in reality and tube length extension goes up too much for high NA objectives. So my 5x eyepiece protrudes out 35 mm, which makes optical length around 195 mm. Only mono head from Nikon model S can take that 5x eyepiece. My 5x eyepiece is 65 mm long, bottom to flange.
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