Monday, April 05, 2010

Canon 5D Firmware 2.0.4 iris bug effects EF 100mm lens

The 5D Mark II Team blog reports a problem in firmware 2.0.4 which occurs when the Canon EF 100mm f/2.8 Macro USM lens is mounted on the camera. It the user manually changes focus (rotates focus ring), the lens changes the iris/aperture “by itself”, even when the camera is in full manual mode. It does not happen in Firmware 1.1.0.

More information can be found here: Malfunction in Firmware 2.0.4

[UPDATES 4/6]: Canonrumors notes that this might be a function of Macro lenses rather than a "bug" though it's odd that in the original report there was a specific claim that the lens did not behave the same way with the previous version of the firmware.
Meanwhile, the 5D Mark II Teams post has been expanded to include notes about some third party lenses making "weird noises."

1 comment:

Anonymous said...

We have updated the Report of the malfunction found on Firmware 2.0.4, including more video tests that clearly show the problem.

- It can be found here:

Malfunction in Firmware 2.0.4 UPDATE

- We also elaborated and published a List of Lenses Affected by this iris issue.

There IS a clear issue on Firmware 2.0.4, very easy to reproduce, that will be fixed by Canon in near future.

Some comments posted in the past at Canon Rumors arguing this iris behavior is normal, are completely wrong. Some people didn't take enough time to read and watch the reports and videos carefully, so they misunderstood the problem.

In fact the "iris jitter" does also affect some non-Macro lenses too, as shown on the updated report.

We hope Canon not only fixes this issue, but also includes some additional features in the next firmware update.

We encourage all users who experience this issue to report it to Canon and also request the most important improvements they need for the 5D Mark II.

Feel free to post your experiences in our blog too.