abe
lvl.4
Flight distance : 524032 ft
United States
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I believe a .9 filter produces a 3-stop reduction in light hitting the lens. Any idea why this is necessary?
Jumping to fact-less conclusions, I suppose it could suggest the camera is optimized for low light shooting and therefore requires an ND filter for daylight shooting. And the upside could be that nighttime shooting, sans the ND filter, could be much improved over the Phantom 2 V+, which is pretty poor in low light.
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