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5D mkIII footage flashing when ISO is set manually

fr3nchie
Apprentice

Hi,

 

I noticed when filming with my Canon MkIII that the footage was strobbing/flashing (as if quickly switching between two exposures). Also the LCD screen switches between two exposures, perhaps every 5 seconds or so. It took me a while but I realised this only occurs when the camera is in manual mode and the iso is set to a value (not on Auto). I've tried everything, re-set all my preferences etc.. But the problem persists.

 

Has anyone experienced a similar issue, or have any idea as to what could be causing this?

 

Many thanks,
Marc

5 REPLIES 5

Peter
Authority
Is it same without a lens? I have the same with my 6D and with an old lens adapter.

Hi Peter,

 

Thanks for your response. Yes I just tried filming with no lens and I get the same result..

 

marc

Can you upload a sample at perhaps youtube or here?

I managed to fix the problem.

 

I have magic lantern installed on my camera to enable raw filming, there was a setting in there accidentally turned on. 'HDR shooting' which I'm guessing shoots two different exposures simultaneously..  

 

Thanks,

Marc

Peter
Authority
Yes. Hdr video will give you that effect.
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