I translated some stuff from a Japanese QC memo, sorry if the english is not\n100%\n\n\nSome of the 828 lenses will experience a higher than normal incidence of\nChromatic Abberation AKA CA or purple fringing.\n\nTo identify lenses that have the defect look at your lens from an angle, if\nyou see a slight blueish reflection then your lens has a defective coating\nformulation applied and did not get noticed by Zeiss/Sony QC. The blueish\ncolor is caused by too much cobalt added to the formulation creating a shift\nin the lens reflective index and causing the spectrograph curves to be out\nof tune with the sensors internal collaminator, causing a purple shift in\nhighlighted subjects during high contrast wide aperture photography. A work\naround is either RMA the product or shoot at F8. The only items that require\nreplacement are the center focuser optics with P/N: SN23944-F91 which has\nthe proper levels of cobalt applied. After replacing the CFO adjustments\nneed to be made to the WB Sensor corralator cpu to insure the new curve\nshifts are taken into consideration during automatic white balance.