ssymeono wrote:
I believe something very similar if not identical is made commercially. I own a Macro Slider made in Japan by Velbon. When I attach it to the Nikon Bellows PB-6M (macro copy stand), it gives the most minute and accurate movement even for extreme close-ups. I attach a picture of a tiny seed next to a mm scale made with a Macro-Nikkor f=35, 1:4.5 from a distance of 3cm.
Amazing! My macro is more traditional (so-so).