Here is the camera that we use, and have used for years. We get these cameras at https://www.photomed.net/ You can buy these cameras and lenses elsewhere too, but if you buy it at https://www.photomed.net/ they will set it up for you and give you the settings as well, so it is ready to use out of the box.
Some office really like the SHOFU camera. https://www.shofu.com/en/product/eyespecial-c-iii/
It’s also important to use good mirrors and usually have two assistants take the pictures so you get nice clear images. I hope this helps.
As for F stop: for closeups you want to set the F-stop to 22, and for full face portraits set the F-stop to 5.6