Although more research work over the past 35 years or so has gone into the assessment of lenses for aerial reconnaissance and survey than perhaps for any other photo-graphic application, it is only comparatively recently that really objective techniques have begun to be brought into use in the production of air cameras. The reasons for this are probably the complexity of what, on the surface, appear to be rather simple problems, and reluctance on the part of those concerned with the hard facts of camera production to become involved with techniques that may appear more esoteric than practicable. The subject of image formation has been a rich field for high-level academic activity for a long time, and the real need today is to bring the theories and methods evolved into routine use in specifications and manufacturing processes.
A C Marchant, A C Marchant,
"Progress In The United Kingdom Towards Objective Standards For Air Camera Lenses", Proc. SPIE 0046, Image Assessment and Specification, (1 June 1974); doi: 10.1117/12.953984; https://doi.org/10.1117/12.953984