If you own a spot meter or have access to one check out the book "Beyond the Zone System" by Phil Davis. I followed his instructions and converted my Pentax spotmeter to a densitometer. It works great! It is still available as a spot meter. Nate Monnoyer Philippe wrote: >Hello, > >I am searching for instructions to build a self-made densitometer. Can >anyone help on this ? > >Thanks, > >Philippe >