DURING FILM PHOTOGRAPHY, we had ASA (AMERICAN STANDARDS ASSOCIATION) printed on the film cartons. Then it became ISO (International Standards Organisation)---(the year difficult to recollect-may be in late 80s). ISO 50, ISO 100, ISO 400 so on. Tri-X B&W from kodak(35mm) was the most famous in ISO 400 range and developed in finegrain developer, rendered wonderful results. This was generally used by pros and photo-journalists in normal and low-light conditions AND ALSO USING higher shutter speeds. During development its speed cud be enhanced to ISO 800, but with compromise with slight grains. The DIGITAL technology too adopted the same sensitivity in their sensors. Now let us look technically. The ISO HAS A DIRECT IMPACT on the exposure. There higher ISO number indicates an increased amount of sensitivity of the sensors. Therefore a higher ISO number allows you to use a faster shutter speed. However, the higher the ISO, the increase in noise/grain u have to bear. For normal sunlight ISO 100/200 is ideal...In cloudy dark, you can increase it to Iso 400/800. As said also in low light better switch to higher ISO to use higher shutter speed, so less camera shake/blurred image. The image i shot alongside used ISO 400, since it was cloudy dull atmosphere. The overhead angle and play in sand suits the picture, as my g-son's face is a focal point and hands busy in activity with a textured sand.
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