I have set the system up and run it with a 3x magnification test photo of a 5p coin.
The step size was 10 micro metres.
The delay between stepper motor steps was 0.0001 second.
The camera was set on manual mode, with a 1.6 second exposure on f/2.8.
Only natural light was used.
1242 slices (individual photos) were taken. This took about 2 hours. The process is entirely automated so I only had to start the script running and then leave it to get on with the job.
Below are some photos of the setup:
In my initial test, the teeth of the cogs kept disengaging under the opposing forces of the motor and the heavy camera. I wedged the board in place with some wood, and weighed the wood down with heavy books.
This is the setup from the other side. The coin is on a paint pot and a blob of blu tac, which makes it very stable and allows easy height adjustment. The lens of the camera is propped up on a screwdriver.
There is quite a long working distance between the camera and coin because I was only working at x3 magnification.
I did not photograph right through to the back of the coin, because the camera ran out of batteries before I reached that point.
Here is the stacked image from Helicon Focus:
So far so good...
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