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拍摄非常暗的被摄体(低照度长时间曝光),或高速摄影(瞬时间曝光)时,要求照相胶片和平板的感光度要高。长时间曝光的摄影和短时间曝光的摄影所采用的有效方法不同。本文研究了在摄影前提高感光度的超增感法。低照度长时间曝光摄影的有效方法有:①预曝光法;②加热法;③冷却法(在低温下曝光);④蒸馏水法;⑤弱碱液法(氨水、硼砂、胺类,例如三乙醇胺等);⑥银盐法(氨化钨酸银溶液等和⑤合用)等。在摄影前用这些方法进行处理都是有效的。高照度瞬时间曝光摄影时,用摄影后显
Filming very dark subjects (low-light long-time exposure) or high-speed photography (instantaneous exposure) requires that the speed of the photographic film and the tablet be high. Long-exposure photography and short-term exposure of the effective methods used in photography is different. This article studies the super-sensitization method of increasing sensitivity before photography. Low-illumination long-time exposure photography effective methods are: ① pre-exposure method; ② heating method; ③ cooling method (at low temperature exposure); ④ distilled water method; ⑤ weak alkaline solution (ammonia, borax, amines such as triethanolamine Etc.); ⑥ silver salt method (ammoniated silver tungstate solution and ⑤ combined) and so on. It is effective to deal with these methods before photography. High-intensity instantaneous exposure photography, with photography significantly