Aurora-Aperture PowerXND 2000 Variable ND Filter with Up To 11 Stops (ND 2000) of light stopping power.
Specifications:
Range – ND 16 – 2000 (ND 1.2 – 3.3, or 4 – 11 stops)
Slim profile of 5.5mm (important for minimum vignetting minimum on wide angle lenses.)
Filter thread sizes: (price increases with diameter).
37mm, 39mm, 40.5mm, 43mm, 46mm, 49mm, 52mm, 55mm, 58mm, 62mm, 67mm, 72mm, 77mm, 82mm, 86mm, 95mm, and 105mm.

Summary of the test report is available at: http://aurora-aperture.com/2016/03/30/powerxnd-2000-lab-test/

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