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Enthusiast
Posts: 14
Registered: ‎02-22-2013
Message 1 of 3 (535 Views)
Accepted Solution

flicker, live view vs playback

I recently made a mistake shooting 23.98 fps, 1/50 shutter with 60Hz LED lights in the background.... plain forgot to adjust the shutter speed to 1/60.

 

With some cameras (XDCAM F800 and Red Epic, if I remember correctly), the 1/50 flicker is immediately evident with live view in the viewfinder and monitor.

 

The F55, we only see the flicker upon playback.  Any suggestions why ?

 

Tech notes:

Recording XAVC 300 Quad 23.98, S&Q 48 fps, at 1/50 sec.

Viewfinder 'double speed' setting defaulted to off

SDI 1 o/p was 23.98 Spf to a Flanders 24".

Playback from the SxS cards on site revealed the flicker.

 

Thanks in advance - 

 

 

 

 

 

Expert
Posts: 2,213
Registered: ‎11-23-2012
Message 2 of 3 (502 Views)

Re: flicker, live view vs playback

When the cameras base rate is set to 23.98fps you are going to be monitoring at 23.98fps. Meanwhile the sensor in S&Q 48fps is running at double the monitoring rate, so you will only see every other frame while shooting so you may not see the flicker. This would be true of any camera set up in a similar fashion.

 

When you play the clip back it is slowed down to 23.98fps, so now you do see every frame and will see any flicker.

 

I always recommend that if shooting S&Q that after the first shot you do a playback check for exactly this reason.

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Expert
Posts: 267
Registered: ‎04-30-2013
Message 3 of 3 (339 Views)

Re: flicker, live view vs playback

Alister is so right - especially in these days of LED lighting fixtures, it can be very easy to have flicker problems even when you are doing everything "by the book."

 

I was recently shooting with some theatrical LED lights - 60Hz power, shooting 60fps at 29.97p for TV - so I put in a 1/120 shutter - seems brain-dead simple.  But on playback there was flicker on the LEDs... turns out a 1/100 shutter worked, even though everything was labeled 60Hz...

 

If I hadn't checked playback, I wouldn't have realized until it was too late.  And that applies to Epic and Alexa just as much as Sony cameras - always check playback.

 

It also helps to watch a waveform monitor - it will sometimes show you flicker that your eye is missing.

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