Canon EF 40mm f/2.8 STM lens
20mm Kenko extension tube.
Lens max magnification specification, 0.18x.
Calculated magnification, 0.68x.
Tethered to an ASUS MeMO Pad FHD 10 (Andriod 4.3). Focus limits, steps and control by DSLR Controller.
Gitzo, RRS, Acratech support.
Composites were stacked from the RAW .CR2 files, automated with Helicon Focus, saved as tiff, converted to jpg, cropped.
10 frames at f2.8, failure is obvious.