AF101 shutter problem?

B

biffen882

New member
Hi,

I'm having a weird problem with my AF101.
When recording a greenscreen scene I noticed a strange light fenomenon occuring.
Now, this has occured before, with different light sources but I've yet to figure out what I might have missed in the camera settings. It looks alot like the shutter is to high, but it was set at 1/60 and we were recording at 25 frames per second 1080p.

Does anyone have quick fix for the problem seen in the picture below? (The darker areas and whiter areas move downward slowly, but a clearly visible when the picture is crushed with curves.)
The lightning from the lights (flourescent lights) are very even on the greenscreen, so I don't think that's a problem.

/Carl

Sequence 01.Still001.jpg
 
If you are shooting at 25fps, I assume you are shooting in a 50hz country. I think your shutter needs to be set at 172.8 or something like that to avoid the strobing of the fluorescent lights.
 
Thanks for your replies!

Well, I'm in Sweden, and I do belive it's 50Hz here.
Yes, and I tried that too! In fact, I tried most of every shutterspeed/setting but these problems still remained, although with 1/60 they were the most invisible to the naked eye (however, in post they showed up and really frustrated me). And these lines can be shown even when there's no lights around (just lightbulbs/natural sunlight). I´ll try to find a still from that scenario as well.

I did, however, see a significant improvement when switching from Film to Video Cam in the camera settings.

It's very probably I might have missed something in the settings. I'm still getting to grips with the camera itself, even after 5 months.

/Carl
 
If the light seems to be pulsing its def the shutter speed setting and should be 50 or multiples of 50 shutter speed.

Steve
 
Carl,
I agree with what the others have said about matching your shutter speed to the frequency of the AC power going to the lights. If using dimmible LEDs, put them on full power. I've heard reports from others that some LED units can cause problems when dimmed. But I don't understand why you would have this problem with regular incandescent bulbs.... strange.
 
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Again, thanks for your replies!

I´ll have a look at the shutter speed again and see if I can match it up better. I´ll post the results as soon as I can!
 
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