Carl Zeiss Jena - 135/6.3

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For heavens sakes. It is a 135 mm Tessar in a who-knows-what mount. The lens rear node-to-film plane distance at infinity is by definition 135 mm. The rear node is fairly close to the barrel's midpoint. 120 mm or so from the back of the mount is a good conservative (= probably too short) guess.

Thanks Dan!

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Does anyone know what the exact thread mount, this lens has? I measure it, to be close to 25mm, but want to be sure before ordering an adapter.

Thanks for all the help.