i have experienced this phenomenon using the 5d2 in conjunction with DynaLites and pocket wizards during VERY meticulously controlled before and after shots for QVC clinical trials.
we use the same heads with the same modifiers (each on their assigned head) with all light positions tape measured and power settings recorded. same camera and lens shooting tethered through canon utility using the Kelvin WB setting. shots are typically a series of 3 shots over the course of 1 to 2 months. always against a white seamless. we measure and record all lighting/modifier/camera positions every time so that each shoot is as identical as we can possibly get them.
all shots are scrutinized by the legal department and must be identical in lighting or they get bounced and the client loses the ability to use the photos to promote whatever product they are pushing on air.
under these controlled circumstances i have occasionally seen color shifts during same day shooting. it is a mystery to me as well but we deal with it by correcting the Raws in ACR. i would chalk it up to either inconsistent light output or just the nature of how the sensor works. it would be nice if the sensor performed exactly the same every shot for tens of thousands of consecutive shots but it is more likely that on occasion there could be a slight inconsistency. such is life...perfection is elusive if not impossible to achieve.
we use the same heads with the same modifiers (each on their assigned head) with all light positions tape measured and power settings recorded. same camera and lens shooting tethered through canon utility using the Kelvin WB setting. shots are typically a series of 3 shots over the course of 1 to 2 months. always against a white seamless. we measure and record all lighting/modifier/camera positions every time so that each shoot is as identical as we can possibly get them.
all shots are scrutinized by the legal department and must be identical in lighting or they get bounced and the client loses the ability to use the photos to promote whatever product they are pushing on air.
under these controlled circumstances i have occasionally seen color shifts during same day shooting. it is a mystery to me as well but we deal with it by correcting the Raws in ACR. i would chalk it up to either inconsistent light output or just the nature of how the sensor works. it would be nice if the sensor performed exactly the same every shot for tens of thousands of consecutive shots but it is more likely that on occasion there could be a slight inconsistency. such is life...perfection is elusive if not impossible to achieve.
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