Auto Exposure Shift on 5D

djkarn105

djkarn105

Well-known member
So, this may be a case of my friend being an idiot, but I thought I'd get some feedback from people for things to look out for.

I recently let him borrow my 5D for a shoot and he says that on a couple of occasions the exposure would change even though he was in manual mode with manual nikon glass on the camera. I haven't seen the footage yet but can anyone think of anything he could have accidentally set in one of the presets that would do this?
 
I'm having the same problem. We shot talent in front of a greenscreen recently, and there was some flickering happening. Full manual with a Nikon 80-200mm f2.8 lens. So it's something the camera is doing. It was driving me nuts! And I still don't know why it was doing it. Happens other times too with a variety of lenses. Is something perhaps still in auto?
 
I've noted this and wondered if it's a setting I've overlooked. 24-105mm f/4. Firmware 2.0.4. I know I need to update but didn't think this lens was affected.
 
I've noticed similar with a 7D shooting a Tamron 17-50mm lens ...

Did 19 interviews and on some there was a drift in exposure..

I'm also sure all settings were on manual...

Cheers
 
So it sounds like a number of people are seeing this?
What kind of conditions are we talking about?
 
With the lens and firmware listed above I was shooting a low light interior in manual mode with a 3 point light setup w/ daylight filters. (2 lowell Pro, 1DP) All other lights were off. F/4, speed at 50, the iso was pretty high at 800 or so.

I did have Auto white balance on. Perhaps that was it?
 
So I took a look at the footage my friend shot. It was shot in a studio, camera on a tripod, during the first part of the day which rules out any chance of lighting changes or overheating issues with the camera. In looking at the footage I noticed that the exposure of the subjects stayed the same but it was the background which was much darker that was changing.
I looked through all the settings in the camera and came across one suspiciously named "Auto Lighting Optimizer". Here's an article with an example of what it does.
http://thefire.us/archives/292

I'd be willing to bet money that this is the cause of this strange exposure shift. The footage is showing what this function is supposed to do, why it would kick in and out in video mode I have no idea but suffice it to say it seems like a very good idea to turn this off. I've turned it off in my camera and I'll see if I notice this strange behavior happening again.
 
That's how I would describe my shift. A dark wall in the background suddenly lightened.
Looks like you figured it out. Thanks.
 
You must log in or register to reply here.
Back
Top