These were shot with the reverse 50 setup I use. These Stones are small as a result of Lithotripsy. Lithotripsy is a surgery where they blast the Stones with shock waves while they are still in you.
1

You can see by the jagged edges why they cause so much pain! :O
This bad boy I just passed last weekend, early Saturday morning. From the 0 to the first line on the right is 1/8th of an inch. This image is a stack of 5 images to get the DOF I needed. I wouldn't wish Kidney Stones on my worst enemy.
2

Here is a crop of above.
3

Those of you that don't get Kidney Stones, count your blessings!

