Canon 1D
Canon 1DCanon

Canon has issued a product advisory aimed at its 1DX Mark II users, confirming that some images saved to SanDisk CFast cards end up corrupted. In the advisory, Canon details that both RAW as well as JPEG images are affected. While RAW images show signs of corruption in the bottom right corner of the image, in JPEG files, the bottom third of the image comes out corrupted.

Apparently this applies only to the last few images shot using the 1DX Mark II. Canon also says, "We would like to offer our sincere apologies to users who have been inconvenienced by this issue." In the advisory, Canon also adds that only CFast cards manufactured by SanDisk and used on the 1DX Mark II are affected.

Canon says that videos shot using SanDisk CFast cards are not affected by this, and the phenomenon does not present itself while recording images or video using compact flash (CF) cards made by any manufacturer.

The good news is that not all SanDisk CFast cards are prone to this issue. Canon is asking users to verify whether their CFast cards correspond to the following models:

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)

Canon notes that the "x"s are variable numbers that are affected by the region in which the cards are sold.

The company also announced that 1DX Mark II users can expect a firmware update that would be out in early July, to fix the issue. Until then, it advises users to take a few extra shots before powering their cameras off.

The problem seems to affect files smaller than 16 MB in size that were shot just before powering the camera off. Canon says that if users shoot one RAW image before switching the camera off via the power switch, pulling the battery out, opening the CFast card slot or the camera gets switched off thanks to the auto off feature, the phenomenon may occur.