Tuesday, 24 March 2015

Focus Stacking Coins of the Realm.

This page leads on from Testing the Focus Stacking System.

Today I've been doing a bit more testing of my focus stacking system, photographing a 5p coin.

The purpose of this was to test the effect of taking shots at larger and smaller increments by controlling the scanner differently.

The script scanprogramme.txt gives larger increments (about 0.08mm I think). The script smooth.py gives smaller increments (about 0.02mm-ish, probably).

According to the documenation of my camera lens, the depth of field at the maximum 5x magnificaion is about 0.1mm, so the bigger increments should really be enough.

Here are some results:

With larger increments the individual shots look like this:



and the focus stacked image looks like this:



With smaller increments the individual shots look like this:





and the focus stacked image looks like this:





I find it hard to say whether there is any improvement from using the tiny increments over the larger ones.


This is the setup that I used (The train set in the background is the important part, obviously):







The next page in this series is A Fern Crozier of Extreme Smallness.