A company from California called Aurora Aperture has introduced a variable density filter that can cut up to eleven stops of light, an amount it claims is more than any other variable ND on the market. The Aurora PowerXND 2000 has a rating of ND 16-2000 or ND 1.2-3.3, meaning that it can reduce exposures by between 4 and 11 stops. While there are filters with fixed ND values greater than 11 stops, variable neutral density filters usually stop at 10 stops.

The filter uses a slim profile frame that the company says makes it particularly suitable for use on wide angle lenses. Made of what Aurora Aperture describes as 'aerospace grade aluminum' the frames are just 5.5mm thick and feature lubricant that maintains smooth movements in an extended temperature range.

The filters are available in 67mm, 72mm, 77mm and 82mm sizes via a Kickstarter program this month, followed by sales to the general public and retailers in the summer. The company plans sizes from 39mm to 62mm and 95mm in the future. The filter will cost $159.

For more information visit the Aurora Aperture website.

Press release:

Introducing PowerXND 2000
The most powerful variable neutral density filter*.

With the best light reduction and resolution capabilities,  PowerXND 2000 filters can be used in a wide variety photography as well as video applications. It’s one filter that can replace multiple fixed ND filters.

Extended range

The PowerXND 2000 has 11 stops (ND 2000) of light reduction capability which has been only available with fixed neutral density (ND) filters until now whereas commercially available variable ND filters only have up to 6 stops (ND 400) capability.

Design
Slim filter frame

Designed in California, PowerXND 2000 has an innovative filter frame design which reduces the overall profile of the filter. This reduced profile is important for keeping vignetting on wide angle lenses to minimum.
The filter frame of the PowerXND 2000 is optimized to reduce height and volume. With a filter height of 5.5mm when mounted on a lens, the PowerXND 2000 is about half the height of other commercially available variable ND filters and smaller overall.

Optical Quality
6 elements and 2 groups

Multiple layers of nano coating technology are applied to glass surfaces for both light reduction and anti-reflection purposes, thus eliminates color shift and provides protection to filter surfaces.

Precision and Durability
The Aurora PowerXND filters are built from aerospace grade aluminum frames with computer numerical control lathes (CNC) for mechanical precisions and treated with anode oxidation process for corrosion protection. Extended temperature range lubricant is applied in the assembly process so the final products have smooth and yet dampen rotation handling for all weather applications.

Specifications
* Range – ND 16 – 2000 (ND 1.2 – 3.3, or 4 – 11 stops)
* Slim profile of 5.5mm

Available filter thread sizes:
67mm, 72mm, 77mm, and 82mm
Planned filter sizes:
39mm, 40.5mm, 46mm, 52mm, 55mm, 58mm, 62mm, and 95mm

Availability
The Aurora PowerXND 2000 filter will be available through kickstarter.com crowd funding in February 2016, and to general public as well as dealers in Summer 2016.