You do use the age ol' trick of placing coins atop a platform of bread, adjusting the height of said bread platform with lunch meat, cheese, or other sandwich-type filler until focused (or I can only assume that's the function?)... I hope I'm not revealing your proprietary set-up... it certainly is a tasty setup, and I bet it requires much attention and the occasional re-setting up.
Unless one wants to photograph one's own wife naked there is no reason to buy an expensive camera and wasting time on contructing that tree-thing. If you have an Iphone with excelent camera, then all you need is a magnifying glass and an elastic to connect it to the iphone's camera. My iphone has automatic zooming-device, so no blurry picture. It worked very well and with very very very sharp images.
And just to illustrate my point: This is an image from the seller. The coin has the size like a little finger nail: The magnifying glass and elastic: A normal photo from Iphone: If you come close it will blurry: But with magnifying glass I got this result:
While I agree that in most instances and for most applications an iPhone is more than adequate for taking pictures of coins, I think the picture through the loupe is inferior to the unencumbered iPhone shot. The loupe image is only focused in the center of the coin, becoming progressively fuzzy towards the perimeter. Here are cropped side-by-side images. For the iPhone pictures I did adjust the exposure and white balanced using the presumably white paper in the image background.
With a skinny dowel, lower lighting angle, perusal of the camera owners manual to discover an automated exposure bracketing feature, and some fiddling with a template example from @TIF, the 9mm Ionia Miletos Lions head / stellate pattern from Valentinian becomes this. Thanks, everyone!
Thanks for the heads up on the clamp @TIF, I just ordered one from Amazon. I too was shocked at the cost of a "cheap" copy stand. Now I'm looking forward to learning an new aspect of the hobby.
Hm. Maybe one can take a better foto with another sort of magnifying glass. I really don't know. Also the difference is that with loupe one can get a higher pixels in image.