Almost every pro is familiar with the practice of including a calibration target in a test shot to get the color right or to help with processing decisions, or as a first step in color management. They might come close to guessing what this is...the caption reads "This view of the calibration target for the Mars Hand Lens Imager (MAHLI) aboard NASA's Mars rover Curiosity combines two images taken by that camera during the 34th Martian day, or sol, of Curiosity's work on Mars. This image was taken Sept. 9." The photo is by NASA/JPL-Caltech/Malin Space Science Systems, via space.com.
(Thanks to Stan Banos)
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A product of interest today:
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John Igel: "I can't believe they included a Lincoln Penny on the calibration target. But that is no ordinary penny. Here is the rest of the story."
Mike adds: An excerpt from the link: "If you’re wondering why a U.S. penny was chosen—it does seem a bit random, right?—it's because geologists often put pennies next to rocks to show their relative size. The NASA scientists wanted to hat-tip the field of geology."