Test image from Curiosity MARDI containing Ken Edgett

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This image was acquired in the Malin Space Science Systems cleanroom during MARDI calibration testing in June 2008. It shows the MARDI Deputy Principal Investigator, Ken Edgett, holding a six-foot metal ruler that was used as a depth of field test target.

NASA / JPL / MSSS

The other hand holding the ruler, on the right, is that of the MARDI Principal Investigator, Michael Malin. The MARDI is focused at 7 m, so that everything between about 2 meters and infinity are in focus. This image shows a slightly out-of-focus rock (a rounded cobble of Icelandic basalt with milimeter-scale crystals and vesicles) at a distance of about 70 cm, 2.3 feet), equivalent to the distance MARDI will be from the ground after the rover has landed.