topic Re: Exposure problem while rolling in EOS DSLR & Mirrorless Cameras

Exposure problem while rolling

Elieabihatem — Sat, 04 Jun 2016 22:02:41 GMT

Hello!!

I have noticed a problem while shooting with my 5d mark iii yesterday, i have some exposure problem during the rolling process.
With no light changes during the roll you feel like the image shift -2stop smoothly then go up 2 stops, like you are playing with the iris ring going from 2.8 to 4/5.6 then to 2/1.4

Shutter speed 1/50
Lens 70-200mm canon
Samyang 35 mm and 85 mm
Iris 2.8
Iso 160
25fps
1920/1080p

Can anybody explain to me why this can happen?
Thanks,
E

Re: Exposure problem while rolling

RobertTheFat — Sat, 04 Jun 2016 23:51:29 GMT

@Elieabihatem wrote:
Hello!!

I have noticed a problem while shooting with my 5d mark iii yesterday, i have some exposure problem during the rolling process.
With no light changes during the roll you feel like the image shift -2stop smoothly then go up 2 stops, like you are playing with the iris ring going from 2.8 to 4/5.6 then to 2/1.4

Shutter speed 1/50
Lens 70-200mm canon
Samyang 35 mm and 85 mm
Iris 2.8
Iso 160
25fps
1920/1080p

Can anybody explain to me why this can happen?
Thanks,
E

Not sure what you mean by "the rolling process", but it sounds as though you might have exposure bracketing turned on.

Re: Exposure problem while rolling

Peter — Sun, 05 Jun 2016 06:20:27 GMT

Do you have the camera in M mode?

Re: Exposure problem while rolling

Elieabihatem — Sun, 05 Jun 2016 06:24:02 GMT

Yes M mode

Re: Exposure problem while rolling

Peter — Sun, 05 Jun 2016 06:39:27 GMT

You don't use af when video recording? Do you see that the aperture (what you call iris) is moving?

Re: Exposure problem while rolling

Elieabihatem — Sun, 05 Jun 2016 06:44:07 GMT

Im not using AF
And the aperture is not moving
Evrything is normal nothing is changing while rolling exept the exposure with no aperture changes

Re: Exposure problem while rolling

Peter — Sun, 05 Jun 2016 06:52:37 GMT

And would you like to upload a sample?

Re: Exposure problem while rolling

Elieabihatem — Sun, 05 Jun 2016 07:25:06 GMT

I dont have the footage now once i have it i will try to upload something

Re: Exposure problem while rolling

Peter — Sun, 05 Jun 2016 07:38:47 GMT

And you can also check if you will get the same in live view. With my 6D and an adapter for m42 mount my screen goes from dark to bright in live view.

Re: Exposure problem while rolling

Elieabihatem — Sun, 05 Jun 2016 07:30:41 GMT

Ok but u dont know what is the problem? I think in live view i have the same issues

Re: Exposure problem while rolling

Peter — Sun, 05 Jun 2016 07:41:56 GMT

Not really. The adapter works together with 5D classic, 7D and 1000D but not with my 6D. Maybe contacts.