juha t finland
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Posts posted by juha t finland
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<p>It's an old thread, but I might as well put the data here as this comes up with Google.<br>
<br />I measured (or tried to) the pupil ratio of Canon EF 100/2.8 L at five magnification settings. It seemes that 0.94 -0.61 * m is a reasonable approximation. The "accurate" curve levels at ends and is a bit steeper in the middle, but not enough to matter for DoF calculation. I wouldn't mind if somebody checked the end values. If they are about right, the others likely are as well.</p>
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<p>To Mark Keefer: 7D is supported.</p>
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<p>Very funny. You know quite well that different grey values in there represent different colors in the sensor and those can just as well be referred as "channels".</p>
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<p>I wouldn't mind the same thing. I'd like to take red channel from one RAW, green from another and blue from the third and build the RAW from them. Why? In order to scan negatives with camera without blue filters. Setting the white balance from the resulting file would be much easier and it should avoid the noise problems resulting from pure white balance approach.<br /> I don't think the same can be achieved with PhotoShop as Bayer interpolation messes things in this case.</p>
Macro accessories for macro photography
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