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

[sm60]

I am having the same problem , I have tried pulling the battery out hoping to reset the camera but it doesn’t help. Mine seems to clear up after the camera has been turned off for five minutes or so but it is very frustrating. Have you figured anything out?

[Eamonn]

We are experiencing the same problem i.e. shooting the same subject in the same lighting - some shots are OK but others are grossly overexposed. we're working in a childrens medical setting and can't afford not to have confidence in our equipment.

[ebiggs1]

"If you fire the shutter at the moment when the solid state light source is dark, then you may wind up with an over exposure."

Of course this is wrong. If you could fire when the "flicker" is "dark", you would get an underexposure. Not over exposure. If the theory is less light, dark, during a flicker.

For you new to the thread folks, first make sure your lens is working properly. If the lens didn't stop down as far as you have if set, I.E. you set f8 and it only closed to f4, you will get an overexposure. This is the most logical cause but not the only answer for sure.

[sm60]

My camera it didn’t matter which lens I was using, that was my first thought. Camera is at Canon service now for a calibration, not sure if that will fix the problem but that’s what they said it needed. $179.

[ebiggs1]

Okay in your case that is where it needs to be.
You have a 5D Mk 4?

[sm60]

Yes my camera is The 5d mark IV

[Eamonn]

We've had this happen with at least 2 cameras - one was a new one that we recently bought because we thought the older Mk-iii was faulty. So in fact it's happening on Mk-iii bodies and Mk-iv bodies - perhaps the flash is at fault? - again we've tried ex600 and ex580 flash units and still had this issue. We also tend to use dedicated OC cords rather than connecting directly to the hot shoe (we need to as that's to do with the nature of our photography) Again we've replaced the cords and still experienced the problem.

[Waddizzle]

Are you using a Sigma lens?

[ebiggs1]

"Yes my camera is The 5d mark IV"

As asked above, my next question was going to be, are you using Canon brand lenses? Might as well ask if all your gear is Canon brand?

It is highly, extremely, unlikely it is the camera at fault if two different models are experiencing the exact same issue. Most of the time photographic gear, especially in the quality level of Canon, does exactly what we tell them to do.

[Eamonn]

We have established some level of resolution . By holding down the C Fn. on the ex600 we can reset to ETTL. (The flash unit for some unknown reason has been switching to TTL which produces a full power (maximum) flash - hence the massive overexposure of close ups.   (Yes - all our equipment is Canon).  We have experienced this overexposure issue on both ex580 and ex600 flash units.