I encourage people to photograph coins.. personally, I love it. I have Mark Goodman's book, Numismatic Photograph. As a professional numismatic photographer, I can say that there is useful information in Mark's book, but it is only a starting point, and in my opinion, most if it is not the best way to photography coins. For example, images like those I've attached here were not achieved with Mark's methods, but rather a custom built 3 axis hybrid axial lighting system that requires no tilting the coin, no depth of field issues and allows complete control of the light gradient across the face of the coin and image contrast. I have a shot of my set up on my Instagram page at https://www.instagram.com/p/B9cElD2ng0_/ Check it out and many of my other coin images in the gallery.