PolarPro
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How does the ND filter help with jello?
Also I see the 3 pack only includes filters for use on partly cloudy or cloudy days. So if you shoot in the sun you need to upgrade to the $100 pack?
An ND filter helps reduce jello by reducing the shutter speed. The CMOS sensor in most small cameras scans the frame from top to bottom. When the camera moves (usually caused by vibration) before the scan is complete rolling shutter or "jello" can occur. A slower shutter speed can help correct most mild rolling shutter.
Regarding the filter sets:
PolarPro DJI Mavic Filter 3-Pack
Includes a CP, ND8, and ND16, generally speaking (always check your shutter speeds to determine the proper filter) the ND8 is used on partly cloudy days, and an ND16 would be on bright days. I personally use the ND8/PL and ND16/PL 90% of the time.
The DJI Mavic Filter 6-Pack includes some darker ND's and some Polarizer/ND filters which would cover just about any lighting condition.
Let me know if you have any other questions,
Jeff