Abstract: A focus ring, similar in user feel to an optical scope focus ring, for an image sensor based weapon sight, wherein the ring is rotatable in a plane perpendicular to the weapon bore. The rotational position of the ring is sensed electronically and read by a weapon sight control processor, and the rotational position is used by the processor to set the digital zoom of a user accessible weapon sight electronic display. The weapon sight may be built in sections, including a stiff chassis section for the electronics and processor elements which includes the mounting to the weapon. The camera section which may include a combination of visible and/or thermal cameras, mounts to chassis and the chassis is enclosed by a floating housing that is compliantly mounted to the stiff chassis. The focus ring/rotational position sensor section mounts to the housing, thereby isolating the hard mounted weapon sight sections from parts of the sight handled by the user.