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FS7 Shutter
From time to time I shoot under fluorescent lighting which I augment with additional LED lights. In post I notice what appears to almost be scan lines when I shuttle through the footage. I am assuming that is due to the cycle speed of the fluorescent lights. Have you run into this issue and if so, what was your solution?
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4 Replies
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Are you sure that’s not rolling shutter artifacts? Is it only visible when scanning footage or do you see it when you play back in normal speed?
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I see it more when scanning the footage, when I play it back in normal speed, it is there but not very obvious but still there. I have learned about the 60hz cycle speed so I may try setting the shutter to 60 but I may also trying to shoot and 60fps too. Thoughts?
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This is an oldish thread, but I see no answers, so I’m going to do a quick one.
This artifact can be caused by fluorescents, in which case the answer is to shoot in ECS (Extended Clear Scan) to minimize the effect: https://www.manualslib.com/manual/860623/Sony-Pxw-Fs7.html?page=61Faster shutter speeds will actually make this harder, so 23.976 or 29.97 is actually better in this case. But still turn on ECS.
It is more likely that it’s being caused by your LED lights. LEDs often use Pulse Width Modulation to dim the lights, and there is no industry standard for the frequency. If your LEDs were cheap, then it’s highly likely that this is the case. A similar thread from awhile back:
https://creativecow.net/forums/thread/lights-for-dslr-video/#post-2005103
If you find that it’s your LEDs, one solution might be to turn your LEDs on full blast, so they are hopefully not pulsing, and just move ’em back.
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