Round Auto Darkening Welding Hood Lens Filter
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Related Faq
Q
Can I use the lens hood after using the adjustable ND filter?
A
It cannot be used with the lens hood. In order to avoid the problem of vignetting, the outer diameter is larger than that of ordinary filters at the beginning of the design. 
Q
Can you buy a lens hood for the lens?
A
Of course there are filters and lens hoods. 52mm screw thread is one of the best selling bezels on Amazon. 
Q
Can I still use my stock lens hood?
A
We installed it on our Canon RF 24-105 lens and it was possible to use the lens hood on this lens because the lens hood attaches to the lens via the bayonette mount which is on the outside of the lens diameter and the magnetic filter adapter screws into the thread on the inside of the lens. 
Q
Can I still use my factory lens hood on this ND2-ND400 lens filter?
A
To avoid dark corners, K&F Concept ND2-ND400 filters are designed in ultra-wide construction so the front side of the ND filter is one size larger than the camera lens. It is recommended to use a lens hood of a larger size. 
Q
What lens hood will work for this filter?
A
I have the 77mm version of this and I am NOT able to use a lens hood on my Canon 17-40mm wide angle once the filter is on. I haven't tried putting on the hood first and then trying to screw on the filter yet. That's not to say that all lens hoods won't work but for me it does not under the scenario described above. 
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Magnetic Lens Filter Kit
How to remove CPL filter from a lens
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