Matthew Dobrski
Captain
Flight distance : 1831050 ft
Canada
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It's a complex issue ... See, the main idea is to introduce a motion blur to your footage, creating more film like, smooth movement of the ground below. This unwanted, jittery feel of high shutter speed is typical for GoPro style action cameras, where each and every frame will be razor sharp indeed. ND filtering is less relevant in high attitude landscape filming, where the ground is moving slow. Low flight, high paced scenes will benefit from ND filtering, trying to maintain the rule of double frame rate shutter speed (i.e. 30 f/s = 1/60 sec shutter). Naturally for given ISO and filter density you'll have to adjust aperture accordingly.
That said, every ND filter will introduce some sort of coloration to image, which may or may not be desired. Other words, there's no such thing like neutral Neutral Density filter. Confused? I was confused as well until I discovered this truth. This introduced, usually subtle false coloration is correctable during post production in any decent video editor software, but only to a degree since you're dealing with H.264 compression video format, not RAW.
Bottom line, use ND filters of good quality for video to achieve this enigmatic motion smoothness. Polar Pro brand is reputable enough. For still photography you'll gain nothing. |
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