Thank you for the comments.
Colrehogan: I'm using a micro-4/3 Panasonic Lumix G5 camera for the video, recording in MP4 at 1080P, then edited in iMovie on an old iPad2. The camera lens used is a 24mm, f/2.8 Vivitar Series 5 lens in Minolta MD mount, manual focus, great for video work because of the manual focus and aperture control, which on the micro-4/3 format yields an equivalent angle of view like a 48mm lens on "full-frame."
For the audio I'm recording into a handheld digital audio field recorder with a lavaliere microphone, synced up later in iMovie. Importing the audio clips to the iPad is a workaround involving iTunes and a desktop computer. I do this because my old G5 camera lacks external mic inputs.
My You Tube channel includes other videos I've created, many about pinhole photography and large format.
I hope to be able to have a new typewriter series video posted each week.
Thanks for watching.
~Joe