PURPOSE: To lighten the weight of a titled lens so that a conversion of a focal distance and a snapshot can be executed by a hand-carrying operation, by fitting a gun rack, and installing the rear lens barrel which is provided with a diaphragm and is capable of rotating together with a camera, to the front lens barrel for executing quickly the optical adjustment.

CONSTITUTION: A gun rack 3 is installed as one body to the lower face of a front lens barrel 1 on which a telephoto lens system consisting of a front group L1 and a rear group L2 is placed on the inside, and a moving cylinder 5 for holding the rear group L2 is slided forward and backward by length of a guide groove 6 by an operating member 7, in the cylinder of the front lens barrel 1. A disphragm 8 is incorporated in a rear lens barrel 2 installed to the front lens barrel 1 so as to be freely turnable, and a camera 4 is installed so as to be freely attachable and detachable. A snapshot can be executed by putting the gun rack 3 on the shoulder and executing the focusing operation and the diaphragm operation by the operating member by one hand and by the other hand, respectively. Also, it is possible to make this lens inexpensive and also to make the whole body light by using the rear lens barrel 2 as a rear lens system.