The biggest difference, however, is that where in the film days ISO referred to the physical qualities of the film you used, it now refers to an electronic process inside your camera. That means that when you dial in an ISO setting on your camera, 100 is still less sensitive than 200 which is less sensitive than 400, and so on. When digital photography came about, the manner in which ISO was measured stayed the same. You also understood that a roll of ISO 400 film was better suited for lower lighting conditions, like taking photos indoors. So, if you picked up a roll of ISO 100 film, you understood that due to its relative insensitivity to light that it would be most useful for photos taken in bright lighting conditions. The scale on which that sensitivity was measured was 100, 200, 400, and so on, with a lower number indicating a lesser sensitivity to light. WHAT IS ISO IN PHOTOGRAPHY?īack in the film days, ISO was often referred to as ASA, and it referred to the level of sensitivity of film to light. In the meantime, it's time to venture into the world of ISO and learn what it does and how it can impact the look and feel of your images. If you haven't already brushed up on those concepts, just visit those articles hyperlinked above. We've done a guide for aperture and depth of field and explained shutter speed too. You know.aperture, shutter speed, and ISO. For beginning photographers, one of the hardest parts of learning photography is figuring out all those exposure settings.
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