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NASA's Mars Science Laboratory rover, Curiosity, carries the Mars Hand Lens Imager (MAHLI). MAHLI is a camera on the turret at the end of the rover's robotic arm. It is used to take pictures of rocks, regolith, and document the rover's scientific and engineering activities.

The Mars Hand Lens Imager (MAHLI) camera head, as it appeared in 2008 before it was delivered to JPL for inclusion on the Curiosity rover. Pocket knife for scale.
The MAHLI is a focusable camera with a macro lens. It can take in-focus images of any feature that Curiosity's robotic arm points it toward, as long as the subject is more than 21 mm (about an inch) away (and as long as it is not the Sun).
To learn more about Curiosity's MAHLI investigation:
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