Why VND? VND filters provide comfort and versatility in situations where lighting conditions change rapidly. With a VND filter, you can quickly achieve the desired exposure without constantly having to switch filters. This can be particularly advantageous in dynamic shooting scenarios, such as outdoor photography or videography, where lighting conditions can change quickly. Flexible use: When used alone, it acts as a polarizing filter. In combination with a 6-9 filter, it transforms into a variable ND filter. With a manual dial, you can effortlessly and continuously adjust the rotation. True Color technology: Freewell's True Color coating process ensures minimal color shift compared to all other VNDs on the market.