Find out how the PolarPro Peter McKinnon Edition Variable ND’s have become my core iPhone ND filter solution in almost every shooting configuration.

The PolarPro Peter McKinnon Edition Variable ND Filters get a five star rating.

Models in Use: 67mm 2-5 Stop, 67mm 6-9 Stop
In Use Since: September 2019
Compatible iPhones: Universal
Damage, Defects or Issues: None

I place a high value on gear I can use in a variety of different ways. I like solutions that work with a wide array of other equipment, and across a wide range of possible configurations.

ND filter systems made specifically for smartphones tend to be single use systems. The PolarPro Iris ND Filter System is an idea lightweight solution to mount directly over the phone camera. This is perfect for use with a smartphone gimbal, or when I don’t plan on carrying other gear around.

However, this doesn’t work if I plan to use a cage, a lens, or a DOF (Depth of Field) Adapter with a photo lens. In any of these scenarios, using larger, circular photographic filters and step up rings is far more flexible.

The PolarPro Variable ND Filters

The PolarPro Peter McKinnon Edition Variable ND Filters have become my core ND filter solution. I use them with every combination of cage / case / lens I have, on every iPhone, including the iPhone 11 Pro Max.

A variable ND filter works by placing two glass polarizing filters in a housing that keeps the rear filter still, while allowing the front filter to rotate. Incoming light is polarized as it passes through the first filter. As this light passes through the second filter some of it is blocked depending on the relative angle between the two filters. If the front filter is in perfect alignment with the rear filter, the light is allowed to pass through. However, if the front filter is rotated a full 90 degrees relative to the rear filter, no light can pass through. Between these extremes the amount of light able to pass through can be varied.

There are some downsides to this method. As the difference in angle between the two filters becomes larger, unwanted artifacts become apparent. The solution is to limit the rotation angle and density range of the variable ND filter.

The PolarPro Variable ND filters come in two strengths. A 2-5 stop filter, and a 6-9 stop filter. Each one operates within it’s optimal range of rotation, avoiding cross polarization artifacts.

In addition to avoiding unwanted artifacts, the PolarPro variable ND filters are made from high quality fused quartz glass with high quality coatings. This ensures the highest level of optical performance that can be expected from a variable ND filter.

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