K&F CONCEPT: Variable ND Filter



K&F Concept, or Kent Faith, is a photographic solution provider. They are specialized in design, research, manufacturing, and marketing of photographic and video equipment.

Thanks to them I had the pleasure to test the new ND2-400 Variable Filter for my camera Lens both for my photographic and video works.


I chose the 82mm size so I can use it both on my largest lens (the Sony 16-35mm F/2.8 GM) and smaller diameter lenses (like my Sony 24-105mm F4 G) using cheap adapters easily findable on Amazon.

A variable ND filter is really useful because it allows you to control the exposure mantaining the shutter speed and the aperture fixed, based on the effect you want to achieve. This filter is designed to prevent overexposure and maintain image purity and quality.

K&F Nd Variable Filter 82mm
K&F Nd Variable Filter 82mm

K&F Concept Variable ND Filter is made of Japan-made top optical glass and allows you to reduce reflection and glaring. I have tried this filter in several situations, it can be adjusted by 9 stops from ND2 to ND400 and it does not affect the quality of the images and I had no vignetting and dark corner problems.