A camera includes a lens arranged on an optical axis for focusing an image upon a focal plane bounded by rails that define a reference for locating an imaging medium relative to the focal plane, an electronic image sensor, and an imager mounting plate supporting the image sensor against the rails in the focal plane. By including on one or more of the rails a plurality of alignment holes that are precisely located relative to the optical axis, and a like plurality of locating pins on the imager mounting plate, the pins on the mounting plate locate into the corresponding holes in the film rails to center the image sensor with respect to the optical axis at the focal plane.