canon 5D Mark II exposure reading problem

srich250

Before I ship my canon to CPS I would like to ask 'the pros' for the answer........here are the details.

when i take an exposure reading on Tv or Av I get two different readings usually 1 1/3- 1 2/3 stops different whether the camera is in the landscape or portrait position.

i talked to CPS for an hour today and they have never heard of the problem. we troubleshot with 2 diff. L series lenses, all 4 metering modes, grey card, i updated the firmware, cleared all functions, and still in landscape/horizontal shooting position it reads light correctly. then when i rotate the camera to a vertical/portrait position, it underexposes drastically.

any thoughts?

thank you

ziggy53

What metering mode is the camera in?

P.S. Nevermind, you already mentioned:

srich250 wrote: »

... all 4 metering modes, ...

pathfinder

Ae you using an off center AF point, perhaps?

ziggy53

Have you compared the EXIFs from the different files to see if that gives a hint?

srich250

5D Mark II exposure problem
thanks for all your interest in helping

- all 4 metering modes have same issue
- using konica minolta meter and a 50D and 2 L series lenses to make sure all tests are accurate.
- it is not lens specific. happens with all lenses.

every time the 5D Mark II is rotated from landscape to portrait the exposure changes by more than a stop.

srich250

pathfinder wrote: »

Ae you using an off center AF point, perhaps?

always center
thx

srich250

ziggy53 wrote: »

Have you compared the EXIFs from the different files to see if that gives a hint?

let me check
thx

ian408

I was going to suggest distance from camera to subject and possibly also the relationship of the subject to camera but it sounds like you've covered that.

Truly bizarre.

Qarik

can you clarify..does the meter reading actually change or does it simply underexpose the final image? T and A are auto modes so the meter should always be at 0?

Also if you change the exposure comp..does this help the underexposure?

I can't recall what now exactly but I thought that there were some parameters that changed from landscape to portrait modes..like focal points? you can have them auto switching as you turn. Are there anyother paramters that automagically switch that you know of?

Jane B.

Qarik wrote: »

can you clarify..does the meter reading actually change or does it simply underexpose the final image? T and A are auto modes so the meter should always be at 0?

Also if you change the exposure comp..does this help the underexposure?

I can't recall what now exactly but I thought that there were some parameters that changed from landscape to portrait modes..like focal points? you can have them auto switching as you turn. Are there anyother paramters that automagically switch that you know of?

I don't have the camera in question but if where the focal points are in the frame changes in landscape vs portrait mode it may well have the same focal point reading a different place in the scene and thus give a different reading.

Jane B.