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<p>[QUOTE="rmpsrpms, post: 4995181, member: 31773"]Several things to address here... </p><p><br /></p><p>Using Av mode, combined with exposure compensation, gives a very fast, correct, and consistent exposure, long as you are careful with where on the coin you meter. The camera auto mode will over-expose highlights in order to do its form of ETTR, but with exposure compensation this can be minimized or eliminated. My Canon camera tends to blow out highlights by ~2/3EV, so I set the compensation for -2/3EV and the brightest metered highlights are preserved. Note that metering is for luminance, so for copper it's also important to reduce saturation to avoid blowing out R channel. As you surmised, I set ISO to 100, so the auto mode only affects shutter speed. If I did manual exposure, I'd need to adjust every shot. </p><p><br /></p><p>I do see an advantage to a continuous adjustment capability for lighting, since the camera adjustment granularity is fairly large. If you can make adjustments in less than 1/3EV increments, you could get a more consistent top end. But how many shots do you have to make to optimize exposure? </p><p><br /></p><p>I do of course spend time critically-focusing each shot, and when I finish I move the metering window over the brightest highlights on the coin. This forces the auto mode to meter-down until those highlights fall below saturation, and I get a proper exposure, ie the exposure I'd get if I went through a full manual mode shoot and review, but much faster and less tedious. </p><p><br /></p><p>Regarding raw mode, what do you do with the raw image that is so important to you? My experience is that by carefully choosing how the development is done in-camera, I can get 90-95% of what I want from the out of camera image. If I need higher resolution, I will shoot raw but then immediately convert to TIFF, and do any postprocessing there.[/QUOTE]</p><p><br /></p>
[QUOTE="rmpsrpms, post: 4995181, member: 31773"]Several things to address here... Using Av mode, combined with exposure compensation, gives a very fast, correct, and consistent exposure, long as you are careful with where on the coin you meter. The camera auto mode will over-expose highlights in order to do its form of ETTR, but with exposure compensation this can be minimized or eliminated. My Canon camera tends to blow out highlights by ~2/3EV, so I set the compensation for -2/3EV and the brightest metered highlights are preserved. Note that metering is for luminance, so for copper it's also important to reduce saturation to avoid blowing out R channel. As you surmised, I set ISO to 100, so the auto mode only affects shutter speed. If I did manual exposure, I'd need to adjust every shot. I do see an advantage to a continuous adjustment capability for lighting, since the camera adjustment granularity is fairly large. If you can make adjustments in less than 1/3EV increments, you could get a more consistent top end. But how many shots do you have to make to optimize exposure? I do of course spend time critically-focusing each shot, and when I finish I move the metering window over the brightest highlights on the coin. This forces the auto mode to meter-down until those highlights fall below saturation, and I get a proper exposure, ie the exposure I'd get if I went through a full manual mode shoot and review, but much faster and less tedious. Regarding raw mode, what do you do with the raw image that is so important to you? My experience is that by carefully choosing how the development is done in-camera, I can get 90-95% of what I want from the out of camera image. If I need higher resolution, I will shoot raw but then immediately convert to TIFF, and do any postprocessing there.[/QUOTE]
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