That is why I built DIY microscope with ~40€ chinese C-Mount long-working-distance optic & "Allied Vision" industrial GigE camera.
What you see is about working distance. Yes, it is enough to do hot air without angled nozzle.
9V battery for scale. GigE does a fine job of 30FPS low latency video to the PC. Magnification is partially set by size of computer monitor
![Evil >:D](https://www.eevblog.com/forum/Smileys/default/evil.gif)
Allied Vision "Demonstration Software" is avaivable from Win x86 to Linux arm_v8 64bit. I tried running it on orangepi - just fine.
Only downside is said cameras are only avaivable sporadic on ebay for ~100€ for 1280x1024. But they are very light sensitive.