I was tossing some of the leftovers from my last shoot and noticed this.
I well reveal its identity later if no one figures it out
Camera:D810
Lens:Nikkor 200mm f4 Plus 49.5mm extension tubes
Tubes: Nikon manual
ISO:64
25 image stack,@ .0025" or .0635mm per slice, processed with PSCC and Helicon Focus