Quote:
...no way for me to just hold it steady enough
Any iPhone or other camera can easily be attached to an old camera tripod stand which enables one to incrementally focus in on desired areas.
An iPhone's iOS software, for example, allows a user to fix the focal length by tapping and keeping a finger on the screen until it signals that the auto focus has been disabled.
With this procedure the sometimes annoying auto-focusing is absent and the user can use the crank handle of the stand to move the camera up/down.
Also, one can buy a clip-on high mag. lens to most smartphones to take much better higher resolution shots compared to USB cameras. I stopped using my USB setup over two years ago and have been pleasantly surprised at the results for both regular and close-up shots.
Currently 30k views for an extremely popular thread w/r/t the aforementioned topic:
http://goccf.com/t/160092&SearchTerms=iphone