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My feedback on K&F Variable ND2->32 filter

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djfoxy View Drop Down
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    Posted: 19 July 2019 at 18:32
Hi there,

I am using a DORR 10 stops ND filter since a few years now after having been deceived by a lot of ND variable bought here and there on the net.

So I had received recently a new K&F variable ND filter 1 to 5 stops just out of curiosity and know what are the standards by now.


I have taken the one for my KM 17-35 so a 77mm filter thread

The packaging is nice with a magnet box outside and a plastic case inside.




I can't say that the filter by itself is thick but by its very own design of being variable ND add a bit of an extra size compared to a fixed ND one.

So it's not possible neither to use the hood nor the front cap for me on this ND variable. Could be the design of the lens and hood, but on KM 17-35 it's not fitting:




On the contrary of my fixed ND 10 stops:





On the other hand one thing I hated when I was playing with my older ND variable filters was the fact that on some zones of the image could I see either a prominent yellow or violet color cast or simply an un-even exposed image with some "blinded" parts of the image.

While using the K&F Concept variable ND2-32, nothing of this showed-up and it was a good surprise.


Scene @ 0 stops (without filter)


Scene @ 5 stops (N32 with variable filter K&F)


Scene @ 10 stops ( fixed ND filter DORR)


That's pretty cool and at the same time it showed me how prominent is the vignetting on my fixed 10 stops filter. I did notice that so dramatically before actually.



So how consistent is it accross the whole stop values ? Well the answer is simple, there is no color shift in between stop values (1 to 5).
Still that's an important thing to me as I recall my older ND variable that would put random yellow or violet splash on some parts of the image.

scene @ 1 stop:



Scene @ 2 stops:



Scene @ 3 Stops:



Scene @ 4 stops:



Scene @ 5 stops:



So here too that's a good point.

Well shooting under such a shiny day has also allowed me to check flare resilience. As many of you already know, the lens itself to start with is pretty weak at this exercise.

scene @ 1 stop:



scene @ 5 stops:


So yes increasing the stop value will play its own role and decrease the sun flares, but still the absence of compatibility with my hood is present. So to keep in mind while on the field.


Quick snap scene:




To conclude I can say that this variable ND filter was a good surprise.
After all the problems I encountered in the past with this kind of accessory I know here that K&F Concept has achieve a mature product.

The design is slick and solid, the coatings are good, vignetting is well contained and the use is consistent accross all the range of ND stop values.

Obviously I keep my fixed ND 10 stops. But 10 stops is a bit overkill, so this ND 1 to 5 stops fits me perfectly now.

I bought the DORR 10 stops for around 70 euros and one can find the K&F concept for anywhere in between 40 euros and 60 euros.

> On amazon K&F Concept ND2-32 variable 77mm / discount code of 15% (available until end of august): LEPUOFEK

> On K&F Concept website K&F Concept ND2-32 variable 77mm

Edited by djfoxy - 19 July 2019 at 18:35
 



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