Adding additional pieces of glass to your lenses can cause softness, but is most noticeable when using long zooms. A good quality variable ND filter will retain as much sharpness as possible and prevent excessive color shift while changing densities. In this test we compare how the original image appears with a standard 70-200mm F/2.8, with the Light Craft Workshop Fader ND Mark II, and finally with the Light Craft Workshop DigiPro HD.
The DigiPro HD retains more sharpness than the Fader ND Mark II from my examples and does not suffer the same color shift properties. These are just two popular variable ND filters on the market, and we will be testing more in the near future. More information about the LCW Variable ND Filters can be found via B&H (click here)
DigiPro ND, Fader ND Mark II, Light Craft Workshop, LightCraft Workshop
Light Craft Workshop Variable ND Filters Fader Mark II & DigiPro HD ND