Review: Polaroid Optics Variable ND Filter vs. LightCraft Workshop Fader ND Mark 2
Tuesday, May 22, 2012 at 8:32PM So I have been told that a Variable ND filter is a must for recording video, especially in event situations (like weddings) where you have no control over lighting. And since your shutter speed is usually fixed, your preference for aperture is generally set, leaving really only a small window with ISO - a variable ND filter just makes things so convenient. At least, more convenient than using set ND filters.
After using a variable ND filter, I definitely agree that they are a must have - though they do come with their drawbacks.
Currently I own the Polaroid Optics Variable ND Filter and the LightCraft Workshop Fade ND Mark 2. The former runs around $55, depending on what size, and the latter runs around $129, also depending on what size you get.
Here are some test shots with them.
Images were shot with a Canon 5DmkIII, using a 70-200mm f2.8L, at the 200mm range.
Image with Fader ND Mark 2

Image with no ND filter

Polaroid Optics Variable ND filter
Notice the striations in the bokeh in the Polaroid VND image, especially in the yellow marigolds. Also, you can see how the contrast flattens with the VND filter in place, as compared with the original image.
Fader ND Mark 2, enlarged image for detail
Image without ND filter, enlarged for detail
Polaroid Variable ND filter, enlarged image
Here you can notice the lessening of detail when a VND is used, though this is more apparent when pushed to maximum zoom in zoom lenses. The plant images have been enlarged to show both the striation drawback and detail loss.
And lastly, here is an image using the 24mm f1.4L with the 5DmkIII.
Image using the LightCraft Workshop Fader ND Mark 2, set to "MAX" setting on the filter
Image shot with Canon 5DmkIII and 24mm f1.4L
Image using the Polaroid Optics VND, set to "MAX" setting on the filter
Lastly, you notice a distinct, almost "X" pattern that developes near the maximum setting of the VND, as regards exposure. Instead of the clean exposure across the image, some areas are darkened more so. You can begin to see the "X" pattern starting around the mid range of the two filters.
However, once again, the LightCraft Workshop filter does a better job than the cheaper Polaroid Optics filter.
Overall, I still think the VND filter is a necessity for the videomaker, but they do come with unintended drawbacks.
