I am not familiar with the green.i brand but my go-to ND filter strength is ND4... for me it seems to work best in a wider variety of lighting conditions. On a partly cloudy day my ND8 looked great when sunny but when a cloud would move in and obscure the sun it just looked awful until corrected in post. So, for me, ND4 is what I use most often.
I use the "Ultimate Studio Series HD Variable ND2 to ND400 for Phantom 3" from B&H. Try this link:
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Ultimaxx Studio Series 7-Piece Filter Kit for DJI Phantom 3 Drones
Buy Ultimaxx Studio Series 7-Piece Filter Kit for DJI Phantom 3 Drones featuring For DJI Phantom 3 Drones, Control Lighting & Protect Your Lens, UV, CPL & Variable ND2-400 Filter, Digital Multi-Coating on Filters, Rose Petal Lens Hood Prevents Glare, Lens Cap/Gimbal Stabilizer, Microfiber...www.bhphotovideo.com
HTHs Bill
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