I use a USB 'borecam/endoscope' to calibrate nozzle height on my 3dPrinter. Those are cheap, small, and you can try them out on your phone.
Not the same thing obviously, but similar enough to get you a feel for it if considering buying the actual SLR version.
https://www.aliexpress.com/w/wholesale-endoscope-cam.htmlimage: view of wherever i last shoved it on my workbench.