1. A microfilming system, comprising; (a) a support (25), (b) plural tables (24,70,73,91) selectively horizontally fitable upon said support to horizontally receive a document (5), (c) a stationary camera (26), having film, a shutter, and actuating means, (d) a non-image-reversing plural-reflective orthogonal optical system (29,27,27') for forming an image of said document upon said film, (e) adjustable mask means (42,44) intermediately disposed in said optical system relatively adjacent to said document to fix the size of the image upon said film, (f) means (46-49) to illuminate said document, (g) an exposure control (22) disposed to receive illumination reflected from said document, and (h) a microprocessor (50,51) for receiving information regarding the presence of (57) and the size of (57') a said document upon said table, and from the output of said exposure control, and for exercising control over said actuating means of said camera, said shutter, and the size of the opening of said mask, in accordance with the information received, on a priority interrupt basis in which exposure of said film has the highest priority.