Canon Lens FD 20mm 1:2.8 S.S.C.
Taken with a Canon T2i/550D and Canon 100mm f/2.8 Macro lens at f/6.3. 48 1/5-second exposures at ISO100 in a focus stack (DoF stack) were combined with Zerene Stacker in DMAP mode. The exposures were spaced by pressing the ">" button on the EOS utility live-view screen.
This is a 50% crop of the original image.