Nikon F5 used to take the image on Foma 400 Action film. Lens not recorded. Enlarged positive image made on 5x7 Efke R25 film developed in Tetenal Eukubrom, and contact negative made using same film and developer.
Calico fabric coated with BVD solution, exposed to direct sun for about a minute and a half - I expose for a long as it takes to see a colour change on the fabric.