Scene description from the Johnson Space Center digital image collection (mission STS-51F; 1985):

Loren Acton, Payload specialist, is working at the Challenger’s aft flight deck station. Acton is using a TV camera for one of the modes of the Shuttle Amateur Radio Experiment (SAREX) to record scenes out of the overhead window. Other material, such as a calculator, floats nearby. Note that the overhead window is covered over except where the lens of the camera has been placed.

HP-41

HP-41

Once I found the picture and its associated mission number, it’s just a matter of a simple search in Youtube to find actual footage of the HP-41. It can be seen at 17:32 on the left side of the video:

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