Sony A7 Nd Filter
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
Will this work from my nikon d3100 lens to my sony a7 body?
A
Nope, it’s to adapt to the smaller Nikon 1 (CX) mount of the 1 series camera, not the F mount (your D3100) on crop and full frame Nikon’s. 
Q
I want to use nikkor 105 mm 1:2.5 (which i bought in 1980's, it is f mount lens.) with sony a7 camera. will ai-nex adapter work my with nikkor lens.
A
K&F Concept Nikon to Sony E lens mount adapter you are asking, you said your lens mount is F, and Sony A7 camera mount is E, so this adapter works for your, please trust to purchase. 
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... 
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