An optical imaging system for milliKelvin temperatures has been develo
ped based on a regular B/W surveillance camera (25 frames/s), with its
CCD sensor inside the 4-K vacuum can of our nuclear demagnetization c
ryostat. The heat leak to the nuclear stage, caused by the operation o
f the video camera, was reduced below 1 nW by careful rf shielding. Th
e construction of the system and its limits of operation are discussed
.