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<p>[QUOTE="rmpsrpms, post: 4990939, member: 31773"]While your ETTR example is not really traditional ETTR (you have only a little over-exposure), my discussion of calibrating backgrounds to black is not really ETTL. Looking at your images, I think our exposure goals are the same, ie to expose the image such that highlights are not blown out, and shadows are not crushed. Generally I use the camera's aperture priority auto exposure mode, which will usually result in some over-exposure, along with some exposure compensation, to keep from over-exposing highlights. When shooting dark coins, the calibrated background is useful to ensure that blacks are not crushed in a similar way as exposure compensation keeps highlights from being blown. That said, I tend to shoot bright coins, so don't use the black calibration method very often. </p><p><br /></p><p>This brings up another calibration technique that I've used for toned coins. By shooting on a middle gray background, and ensuring the backgrounds of all final images are at the same tonality, differences in coin tonalities is easy to manage, and colors are traceable to make sure no "juicing" has been applied. I suppose axial lighting, or ringlights, are most useful for this technique since they give a nice, even illumination across the coin and the background. Other methods will give some tonal gradation in the backgrounds, so that some judgement is needed to set an equal background tonality from image to image.[/QUOTE]</p><p><br /></p>
[QUOTE="rmpsrpms, post: 4990939, member: 31773"]While your ETTR example is not really traditional ETTR (you have only a little over-exposure), my discussion of calibrating backgrounds to black is not really ETTL. Looking at your images, I think our exposure goals are the same, ie to expose the image such that highlights are not blown out, and shadows are not crushed. Generally I use the camera's aperture priority auto exposure mode, which will usually result in some over-exposure, along with some exposure compensation, to keep from over-exposing highlights. When shooting dark coins, the calibrated background is useful to ensure that blacks are not crushed in a similar way as exposure compensation keeps highlights from being blown. That said, I tend to shoot bright coins, so don't use the black calibration method very often. This brings up another calibration technique that I've used for toned coins. By shooting on a middle gray background, and ensuring the backgrounds of all final images are at the same tonality, differences in coin tonalities is easy to manage, and colors are traceable to make sure no "juicing" has been applied. I suppose axial lighting, or ringlights, are most useful for this technique since they give a nice, even illumination across the coin and the background. Other methods will give some tonal gradation in the backgrounds, so that some judgement is needed to set an equal background tonality from image to image.[/QUOTE]
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