伊尔福HP-5黑白胶片,速度为400ASA(27DIN),通过显影技术可以成倍地提高照相速度。显微镜测定表明,假如在稍微曝光不足的情况下拍摄亮度比为1:30的正常景物,用表面显影液加工,其解像力可达85条/毫米。这样高的解像力对如此高感的胶片是惊人的,但在一定程度上,这是以损害颗粒结构为代价而获得的。因此,对于高感胶片兼有两方面的优 Ilford HP-5 black and white film, speed of 400ASA (27DIN), by imaging technology can be doubled to improve the speed of photography. Microscopic examination showed that if a normal scene with a brightness ratio of 1:30 was photographed with a little underexposure, its resolution was 85 per millimeter when processed with a surface developer. Such high resolution is amazing for such high-sensitive films, but to a certain extent this is achieved at the expense of grain structure. Therefore, both high-sensitive film for both excellent