A method for assembling a camera , the method comprising: providing a circuit board with a first surface defining a plane, the first surface having an image sensor fixed thereon, the circuit board including an aperture extending entirely through the circuit board from the first surface to a second surface that is parallel to the first surface and spaced therefrom; providing a lens holder with a lens barrel defining a central axis and supporting a lens in a fixed position relative to the lens barrel , and a post extending outward from the lens barrel in a first direction parallel to the central axis ; orienting the circuit board and the lens holder such that the plane defined by the first surface of the circuit board is perpendicular to the central axis ; axially joining the circuit board and the lens holder so that the post is received by the aperture ; non-adjustably fixing a final alignment of the image sensor relative to the central axis and the lens upon sliding the post through the aperture ; providing a seat formed integrally as a single piece with the lens holder and culminating at a flat surface perpendicular to the central axis , wherein the lens barrel has a first axial end and a second outward-facing axial end, opposite the first axial end, and the post extends further from the first axial end than the seat ; and characterized by non-adjustably fixing a final focal length between the image sensor and the lens upon abutting the circuit board against the flat surface of the seat ; providing an opening in the seat ; and passing a fastener through the circuit board and threading the fastener into the opening of the seat so as to restrain the circuit board abutted against the flat surface of the seat . providing a circuit board with a first surface defining a plane, the first surface having an image sensor fixed thereon, the circuit board including an aperture extending entirely through the circuit board from the first surface to a second surface that is parallel to the first surface and spaced therefrom; providing a lens holder with a lens barrel defining a central axis and supporting a lens in a fixed position relative to the lens barrel , and a post extending outward from the lens barrel in a first direction parallel to the central axis ; orienting the circuit board and the lens holder such that the plane defined by the first surface of the circuit board is perpendicular to the central axis ; axially joining the circuit board and the lens holder so that the post is received by the aperture ; non-adjustably fixing a final alignment of the image sensor relative to the central axis and the lens upon sliding the post through the aperture ; providing a seat formed integrally as a single piece with the lens holder and culminating at a flat surface perpendicular to the central axis , wherein the lens barrel has a first axial end and a second outward-facing axial end, opposite the first axial end, and the post extends further from the first axial end than the seat ; and characterized by non-adjustably fixing a final focal length between the image sensor and the lens upon abutting the circuit board against the flat surface of the seat ; providing an opening in the seat ; and passing a fastener through the circuit board and threading the fastener into the opening of the seat so as to restrain the circuit board abutted against the flat surface of the seat . <EOS>