Even though the Canon 1D X Mark II is an absolute jaw-dropper, photographers might still encounter some issues if they chose to use certain SanDisk CFast cards. In its latest service notice, Canon confirms reports that some of those cards cause image corruption and offer their “sincere apologies to users who have been inconvenienced by this issue.”

More specifically, the bottom part of still images may be corrupted when a SanDisk CFast card is inserted into the camera or a card reader. However, not all SanDisk CFast cards cause this issue. Image corruption may be experienced with the cards listed below (“xxx” varies depending on the sales region):

  • SanDisk Extreme PRO CFast2.0 64GB (SDCFSP-064G-xxx)
  • SanDisk Extreme PRO CFast2.0 128GB (SDCFSP-128G-xxx)
  • SanDisk Extreme PRO CFast2.0 64GB (SDCFSP-064G-xxxA)
  • SanDisk Extreme PRO CFast2.0 128GB (SDCFSP-128G-xxxA)
  • SanDisk Extreme PRO CFast2.0 64GB (SDCFSP-064G-xxxB)
  • SanDisk Extreme PRO CFast2.0 128GB (SDCFSP-128G-xxxB)

The phenomenon is confirmed in images recorded in both the RAW and JPEG formats. In the RAW file, the image corruption may appear in the bottom right corner of the image. In the JPEG file, the image corruption may appear in the lower third area of the image. Movie recording is not affected, and neither are still images or movies recorded to CF cards.

The Canon 1D X Mark II: nót to blame

Even though SanDisk is actually the one to blame, Canon is considering releasing new camera firmware in early July, “to prevent the occurrence of this phenomenon. We would like to ask our customers to refrain from using SanDisk CFast cards when shooting still images until the new camera firmware becomes available.”

If you do still want to use the cards, Canon offers a simple workaround in their announcement, “it is our understanding that image files about 16MB or less recorded immediately before the camera’s power is turned off may become corrupted.” So Canon advises to shoot some extra snapshots before turning the power off, so that the snapshots are corrupted and not your important images. It seems like a risky workaround, but its an option for those of you who are set on using that CFAST slot.