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.