Reviews
Another good K series variable ND filter combination
I have two K&F Concept variable ND filters (NANO-K series ND 2-400, 77mm and 72mm), and both of them have obvious color shift effects. So, I believe that the K series is at low end of K&F Concept ND filter. However, a K series True Color variable ND (2-400, 77mm) is good, without noticeable color shift.
What about this K series Black Diffusion 1/4 & variable ND 2-32? My guess is that it would work similarly with the true color type of K series. And I am right about that. I do a LED reflection test for all filters. The K series ND filters have the blue color, while the true color one has the green color, similar with the true color ND filters of other brands. This black diffusion/ND combination also has the green color, of some different degree.
I like the softer effect of this new filter, and it appears to be an upgrade from the true color version of the K series, with added hard stop ends.
What about this K series Black Diffusion 1/4 & variable ND 2-32? My guess is that it would work similarly with the true color type of K series. And I am right about that. I do a LED reflection test for all filters. The K series ND filters have the blue color, while the true color one has the green color, similar with the true color ND filters of other brands. This black diffusion/ND combination also has the green color, of some different degree.
I like the softer effect of this new filter, and it appears to be an upgrade from the true color version of the K series, with added hard stop ends.
17/03/2026
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