Drones For Construction Use
Related Faq
Q
How to Use it ?
A
You can use it immediately after power on, don't need to install any APP, very convennient. 
Q
What is the meaning of the transparent film in front of the lens
A
It is not aluminum foil, but a slightly sticky plastic film that covers the lens to protect it during transportation, peel it off before use, otherwise it will affect the sensing sensitivity 
Q
Hi guys, how do i work out the correct filter thread size>? i have a canon 85mm prime... and a 70-200mm zoom lenses (does it work on zoom too though)?
A
77mm variable ND filter you are asking, Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "Ø" (diameter) symbol. For example: Ø77 = 77mm lens thread size. hope it helps. 
Q
How many gears does the ND1000 filter reduce the light?
A
Dim 10 gears 
Q
Will ND2-ND400 filter cause X cross?
A
From 1-5 stops, there will be a slight X cross for lens under 24mm. An X cross will appear at the highest stop and can be removed by rotating the filter ring, which is a normal situation instead of a quality issue. 
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