Its not easy Kempire. I take numerous shots through a 10x loupe, sometimes my 20x loupe. With the zoom almost all the way extended. Important thing is to have the spot on the coin I want the photo of, centered in the loop because of the point of focus. Hard thing is to be very still. That means holding the loop in my left hand and the camera in my right very steady and usually braced against my desk.
Mine is a very low level setup. Nothing fancy.
The coin is either flat or propped against something, again depending on what I'm shooting and what angle is best to capture it.
I use an older Sony 5 megapixal 4x optical zoom camera. During the many shots I take I also adjust and reposition my light so I have different angles to select from. Then I upload to my computor, deleting the bad ones, of which there are many. The ones I keep, I edit by cropping out everything I don't want in the photo. The only thing I want to show in the photo is the specific area of interest, like the doubled area. Everything else is out of focus anyway. Good luck and hope this helps.