(Suggestion:lower down the density value gradually and reduce the aperture, until the facula disappeared.). Slim Adjustable ND Filter Feature ND Filter Use effect Made of high quality optical glass by K&F Concept technology.
K&F CONCEPT Fader Variable Neutral Density ND Filter 43/46/52/58/62/67/72/77mm
Adjustable Neutral Density Fader Variable ND Filter ND2 to ND400 for Camera Lens
K&F CONCEPT 2 in 1 True Color Variable Fader ND2-32 ND Filter & CPL Lens Filter
K&F CONCEPT Variable ND2-2000 Neutral Density ND Filter49/55/58/62/67/72/77/82mm
K&F CONCEPT 77mm ND2 to ND400 Variable lens filter Neutral Density for Cameras
K&F CONCEPT Variable ND2-ND32&ND32-ND512 Kit Compatible with DJI Osmo Pocket 3/4
