Russian cosmonauts are performing a spacewalk outside the International Space Station this morning to install a pair of high-fidelity cameras on the Zvezda service module, part of a Canadian commercial television project. 

Commander Oleg Kotov and flight engineer Sergey Ryazanskiy exited the space station at about 8 a.m. ET and are expected to be outside for about seven hours.

They are installing a pair of cameras on the station's Zvezda module — part of a commercial project designed to capture "Earth observation imagery," according to a statement from NASA. 

The job marks the third recent spacewalk outside the ISS, after U.S. astronauts Rick Mastracchio and Michael Hopkins went out twice to repair a conked-out component of its cooling system.