For those that are new to photography, or have never heard of the zone system, it was developed by Ansel Adams and Fred Archer to determine optimal exposure and development of film. In a nutshell, you break a scene down into a gradient of 11 stops going from pure black to pure white and expose for what you want the viewer to focus on:
Zone | Description |
---|---|
0 | Pure black |
I | Near black, with slight tonality but no texture |
II | Textured black; the darkest part of the image in which slight detail is recorded |
III | Average dark materials and low values showing adequate texture |
IV | Average dark foliage, dark stone, or landscape shadows |
V | Middle gray: clear north sky; dark skin, average weathered wood |
VI | Average Caucasian skin; light stone; shadows on snow in sunlit landscapes |
VII | Very light skin; shadows in snow with acute side lighting |
VIII | Lightest tone with texture: textured snow |
IX | Slight tone without texture; glaring snow |
X | Pure white: light sources and specular reflections |
Since you can't always expose for the entire scene, you need to set the camera so that the zone that is most important, say a subjects face, is exposed properly. But that is where many photographers stop. Using lights and reflectors you can often get each zone properly exposed in camera. This area a stop brighter, that area two stops darker. If the scene is too big to light artificially or too complicated, using a tool like Photoshop can allow you to raise or lower a zone in a scene a stop or two to correct the exposure on the zones. If you're Joe McNally you just keep adding SB900's... A better way to do this is to bracket your shot, so each zone is properly exposed spanning several frames, then bring them all together in post. This is the basis of High Dynamic Range images, or HDR. Many think of HDR Photography as a new method, but it's essentially just a new twist on what Ansel Adams was doing back in the day. I'll leave a couple links for some books that might help master the subject, they'll take you to Amazon so you can check out some reviews and take a "look inside" as they say, if available. I highly recommend you check out your friendly neighborhood library to see if they can be checked out there first. That's my first stop to learn about photography!
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