No test required. Your image illustrates the split.
Black and White conversions sometimes,simply, highlight the fact.
I don't have enough experience to say whether the issue is random and will appear every now and again
or if it will always be present.
Earlier Leaf backs were very prone to this problem but were not alone.
I've seen it with various Phase and Hasselblad backs and more recently with
the Leica M8,M9 ,and the S2.
As far as I know,the remedy is a manufacturer re-calibration of the sensor
Track down Yair Shahar ( Yaya ) on this forum,now with PhaseOne, who could
very capably infirm you on this topic.
Hi Mark, I think you're mixing two different issues but it doesn't matter as the results are more or less the same
The line going down the centre of the frame in this case (SLR body, retrofocal lens) is likely a result of readout mismatch between the two sides of the Kodak sensor. Earlier Kodak sensors were using one readout only (and were slower) so usually did not show this. The newer 6µ Kodaks use multiple readouts and if the camera/ back is not calibrated properly (or if the software cannot correct it) then this effect can be seen sometimes
I believe this can be resolved by re-calibration the camera as you have suggested (not sure how Pentax handle this, though)
You've mentioned Leaf backs but in our case this was more related to using wide angle, symmetrical lenses. At the time we offered a custom calibration that was done by the user and then later (about 18 months ago) it was resolved via some clever software algorithms