Variable ND Shootout and are they as good as Solid ND?

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Singh-Ray 77mm Vari-N-Trio:
Hoya 77mm Solas Variable:
SLR Magic 77mm:
Genustech 77mm Eclipse:
Tiffen 77mm:
Hoya 77mm:
Polaroid 77mm:
Benro 77mm Solid:
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Dave's Courses on Shooting Video with Mirrorless & DSLR's:
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