5d Mark IV Metering / over exposure with same settings and lighting

[sdkstudio]

I'm shooting product and taking several shots with same settings with the following: Canon EOS 5D Mark IV Lens EF100mm f/2.8 Macro USM Setting f32 / 1.6 ISO 100 without making any changes or any adjustments to lighting or settings, every 3rd or 4th shot i get an overexposed image. below is 2 examples that i just shot for this post

[kvbarkley]

I don't remember whether it was this camera, but others have complained about the same thing.

[TCampbell]

Since these aren't individual images with EXIF data, I can't inspect camera settings or what the camera did.

Tell me more about mode & settings used.

(I have no issues with my 5D IV)

Were you using flash and if so, can you share details on that equipment and settings as well?

[Waddizzle]

It could be light flicker.

[sdkstudio]

i wasn't using a flash. Here's a list of the equipment and settings:

Canon EOS 5D Mark IV Lens EF100mm f/2.8 Macro USM Setting f32 / 1.6 ISO 100

Lighting setting exact for 

GVM Dimmable Bi-color LED Video Panel Light set at 6000

These photos have all the properties

[Waddizzle]

Light flicker compensation has nothing to do with a flash. Many types of artificial save energy by turning on and multiple times per second, faster than the eye can see.

But, the camera can see it and be fooled by it. Most of the time you get a random under exposure. It really depends on luck. Your solid state lighting is known for creating light flicker.

Another cause of bad exposures is from light entering the viewfinder, especially when the camera is on a tripod. Normally, you head would block light from entering. For this reason 1D series cameras have a cover that can flipped into place that closes off the viewfinder.

[sdkstudio]

Thanks for the comments. I'll test with some incandescent lighting since it's continuos.

[ebiggs1]

It has nothing to do with light flicker.   Lights don't "flicker" brighter. If they flicker, they flicker off!  Call Canon 1 (800) 652-2666

[TCampbell]

Many types of lighting (including LED lighting) pump out just one true luminosity ... but they do blink (flirker) rapidly.  This includes florescent lights, LED lights, and many others.  This is usually not noticeable to people ... but the metering system can detect it.  

AC power cycles 60 times per second.  So it's possible with a fast-ish exposure to have the camera take the shot at dim point that the eye doesn't notice.  If you burst several frames in a row, you get some bright, some dim, many people think the camera is broken ... but it really did capture what was happen at that moment (nothing wrong with camera).

"Flicker Compensation" is meant to detect the cycle rhythm and have the camera take the shot at the moment the lights are bright so that you don't get under-exposed frames.

LED lights also flicker ... most diodes only put out one true brightness and the perception of dimming an LED comes from changing the frequency of how fast it blinks ... the light "seems" dimmer to us.

Dimmable LEDs are generally blinking fairly fast ... and according to the EXIF data, these are both 2 second exposures.

On the other hand... It shows you used "Manual" exposure.  

When you use "manual" exposure... the camera and metering system does not control the exposure.  You control the exposure.   If you set ISO 100, f/32, and a 2 second expsorure time... then you GET ISO 100, f/32, and a 2 second exposure time.  The metering system will offer "advice" ... but it's up to you to set the exposure.  

The EXIF data I see in both shots is Manual exposure mode, ISO 100,  f/32, and 2 seconds.

Were you using a polarizer and you did you rotate it between shots?

Are you sharing all of the equipment involved in the shoot?

Reflectors?

Flags?

Gels?

Filters?

etc.?

Adjustment to these sorts of things can make a big difference in the result.

Based on the EXIF data... there's no issue with the camera metering system because the metering system didn't control the exposure.  It *must* be something else.  

[kvbarkley]

It could be this - see TCampbells answer, here:

https://community.usa.canon.com/t5/EOS/EOS-5D-MARK-IV-Metering-Issue/m-p/224811