Hero 4 Nd Filter
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Related Faq
Q
Can the strength of the ND filter be adjusted?
A
No, the ND filter from the magnetic set is an ND1000 (extends the shutter speed by a factor of 1000). But it would be technically difficult to construct a magnetic, yet adjustable, ND filter. I hope that K&F will bring more filters for the system onto the market over time. 
Q
Does this work with Gopro hero 4 silver?
A
yes. 
Q
Can I use a polariser together with the ND filter with this holder?
A
There does'nt appear to be a facility for holding a circular polariser on this system (i.e. the type you can rotate in the mount) 
Q
can this ND filter be used for solar photography?
A
i very much doubt it... it's worth risking your sensor and or your eyes... 
Q
Will this fit the k&f set for gopro hero 5/6/7 ?
A
No I don't think it will fit any Gopro not unless it's specifically made for it. This size fits a 58mm lens thread and the Gopro has a much smaller size lens. 
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