A kind of endoscope and correlation technique include proximal handle and the distal shaft with insertion end. Shell including photomoduel may be mounted in the insertion end of axis, and including at least one camera lens and imaging sensor. Photomoduel shell is rotatable around the axis of the long axis perpendicular to axis, to provide variable field of view to photomoduel. Rotatable camera assembly housing may be mounted to the insertion end of axis, so that the rotatable housing of photomoduel includes the farthest end element of endoscope shaft or insertion end. Endoscope may include circuit board, which has one or more extensions of the first part being arranged in proximal handle and the light source that photomoduel and/or axis proximate distal ends are extended in axis. At least one optical transmitting set may be mounted in the insertion end of axis, and be configured to the direction projection light along the visual field towards or away from photomoduel. Optical transmitting set also may be mounted on photomoduel shell, and light is guided into the visual field of photomoduel. Electric power and communication line can co-locate in the inner cavity for fluid flushing or suction of the axis of endoscope.
