Under exposing in Raw
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21-08-11, 10:48 AM
Join Date: Sep 2009
The point I'm making is that you want to maintain a set shutter speed to suit your ability to hold the camera steady enough at a given focal length, to produce as clear, and shake free image as you can.
For example, in choosing TV mode you want to premeditate the shutter speed that would give you the best chance of getting a shake free sharp image.
You want to capture an image of something in the distance at a focal length (zoom rating) of 200mm, you would need to maintain a shutter speed of at least 1/200sec. Maybe it would be wise to increase that value to 1/250sec to compensate for additional camera shake. If the image you are trying to capture also has movement that you would like to freeze, you may want to increase the desired shutter speed to say 1/350sec depending on what the subject material is. Lets say with the ambient light of a summers day you chose a fixed ISO of 100, the camera meters the light with a fixed shutter speed of 1/350sec and that results in an aperture value of f14.
You then realise that the sky or reflections in the foreground water (picture the scene!) are going to get blown out. Invoke 1 stop of negative exposure comensation. If that's no good try another. Get home and look at the results: the shutter speed would have remained the same because you were in TV mode, but the aperture would have closed down by 1 stop to f16 in the first image and by 2 stops to f18 in the second. They will be under exposed but they should be sharp and crisp, with the possibilty of rescuing them in post. If you did the same in AV mode the aperture would have remained at f14 but the shutter speed would have reduced and be more likely to end up in a blurred image.
You can be more creative in AV mode with dof (depth of feild) and nice bokeh effects (soft distant backgrounds), and its possible to adjust the settings in the same way, but you would have to keep an eye on the shutter speed as that will be the first thing to reduce if you wanted to dial in negative exposure compensation.
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