ISAAC VFX
lvl.2
Flight distance : 29705 ft
Spain
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Porktree Posted at 12-22 07:16
This looks like a framerate/shutter speed issue. If your frame rate is 25 fps, and your shutter speed is higher, say 1/500, then the shutter is released 20 times per frame. If nothing's 'moving' no big deal, but if the entire frame is panning you never finish a frame completely, so it's like a multi-exposure. Try slowing the shutter speed to 2x your frame rate. (This is where ND filtes come in). I see that it looks good before you zoom in, which makes me more sure that your shutter speed is too high.
Also, I still struggle with this, but slooooow panning is important. I can't remember where I read this but with the MP at 25fps, you should never pan faster than 13 sec (ie replace the whole frame). I'm sure there's a calculation using the 28mm focal length and 77 degree fov that uses the fps to come up with that number, but I don't know it - I just remember the 13 sec.
Thank you for the reply
I always (or almost always) shoot at 1/50 shutter speed with ND filters. The first 3 examples ars shot in that way. The fact is the drone were working very well the first 6 months until this problem arose.
I did tests using different exposure times and the problem was there at all speeds.
The problem for me is stabilitation in Y AXIS, always vibrating right-left. You can see the MB in the video examples below
EDITED:
Also, I thought it could be a problem of a bad attached filter and I did tests without the filters without luck.
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