Mars Reconnaissance Orbiter Lofted toward Mars in 2005, the Mars Reconnaissance Orbiter continues to study the Red Planet while serving as a relay station for other Mars missions, including the Opportunity rover.
Equipped with the most powerful telescopic camera ever built to send to a foreign planet, the High Resolution Imaging Science Experiment (HiRISE) is a 3-mirror astigmatic Cassegrain at f/24 with a 12m focal length. There are 14 detector-chip assemblies, staggered with a 48-pixel overlap, which can be combined to create images up to 20000 x 65000 pixels. The camera, in case you wanted to purchase one, cost $31 million to develop.
As seen by the copy above, B&H's article describing the cameras on board 24 NASA probes, starting with Tiros and ending up with New Horizons, will tickle the cockles of geek hearts, like mine, as it describes in detail just how incredibly ingenious the engineers were in putting tech on hardware able to withstand the rigors of space travel without issue. Give it a read, you will not be disappointed. :)