Abstract: A lens assembly for a camera which enables rotation of the camera relative to a front member of the lens assembly in order to alter the image position thereof is formed with the lens barrel divided into a forward lens barrel part and a rear lens barrel part, with the forward lens barrel part being adapted to be carried on a tripod, and with the rear lens barrel part being made capable of rotation together with a camera body attached thereto relative to the forward or front lens barrel part. The mechanism is formed with a counterbore in the rear end of the front lens barrel part which may be fitted over a head portion of the rear lens barrel part with a clamping device providing a click mechanism being arranged therebetween.