Question about PolarPro PMVND Signature Edition II 6/9 Stops

The main difference between a grey-scale filter and a neutral grey filter lies in their functionality and application. A grey-scale filter is used to attenuate light gradually, often for creative effects such as reducing the brightness of the sky while preserving detail in darker areas. A neutral grey filter, on the other hand, reduces incoming light evenly, allowing exposure control without affecting colours. PolarPro PMVND filters, such as the PMVND Signature Edition II, are variable ND filters that allow you to adjust the amount of light attenuated, but they are not specifically graded.

In contrast, a neutral grey PM filter is not explicitly mentioned in the available information, suggesting that it may be a generic term for a fixed ND filter. PolarPro's PMVND filters are variable ND filters, which means that they offer an adjustable range of light attenuation, unlike a fixed ND filter.