ABSTRACT
Adequate photographic reproduction of megafossils involves geologic problems in securing an emphasis somewhat different from that desirable in most other photography. The writer has been unable to find any systematic treatise on the special problems involved. Through trial and error he has ascertained certain basic requirements for success, and has arrived at a partial solution.
Reproduction of holotypes, paratypes, and other fossils for identification requires a realism that is obtained only by reproducing an original in detail and elevation. These two effects, both necessary, are photographically opposed. To shoot all of a fossil for maximum detail tends to give little elevation, and vice versa. Moreover, this results in a muddy flatness on the one hand, or a glaring caricature on the other. Existing published plates furnish evidence that many geologists and photographers faced with the problem fail to solve it, and produce flattish images in perhaps quarter or half elevation which necessarily have an attendant degree of muddiness.
Partial solution of the basic problem has been effected by using the combination of (1) medium-contrast (detail) film, (2) very uneven lighting, and (3) sufficiently hard printing paper to force full elevation by deepening the resulting shadows to a degree which will just provide full elevation and just avoid loss of relevant detail on the major portion of the image. The total balance is a precarious one, but with most subjects is possible to attain. It partly solves the dilemma of the opposed factors detail and elevation by in effect simultaneously using moderate-contrast (detail) film for major, lighter parts, and strong contrast film for minor, darker parts of the image, thus securing both detail and full elevation.
General procedure is briefly and chronologically set forth in such a manner that even the geologist unfamiliar with photography and editorial requirements may photograph, assemble, and label material for published illustrations.
