Ah yeah this one is great, I watched it more than a few times when trying axial lighting at various points. Is it thought that the acrylic cylinder is doing anything more than allowing light to pass through it, or is there some "unique" effect it is producing e.g. the internal reflections of the light result in a more evenly lit background than if you had just used a flat sheet of acrylic?ray_parkhurst wrote: ↑Fri Dec 02, 2022 10:01 amYes indeed, thanks for finding it!J_Rogers wrote: ↑Fri Dec 02, 2022 9:50 amIs this it?ray_parkhurst wrote: ↑Wed Nov 30, 2022 5:16 pmThere is an excellent and surprisingly high-end You Tube video that shows how to do this calibration. Unfortunately I looked but could not find it. I'll look again but you might try searching as well for axial lighting in coin photography with backlight. I'm terrible at finding such things so I'll bet you can find it before I can...
https://www.youtube.com/watch?v=jvPiMaLy2RE
Would love to get my hands on one of his RAW images to check the edges. I suspect he's having better luck than me just due to the size and shape of modern coins compared to ancients but it would be interesting to know in general whether he's getting any light from the background blending in with the coin's edge.