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For use with the Cambo X2 Pro, the X-228 has a 34.7mm hole for use of lenses with Copal 0 shutters or NK-0 mount. The X-228 is 20mm recessed and is needed in combination with the use of the Schneider Digitar 28mm, 72mm and 80mm. The X-228 is also needed in combination with a 150mm lens, but then reversed mounted.