Micasense have notified us that they have found a latent issue with the RedEdge firmware which will report bad exposure times occasionally for bright scenes. This tends to happen in the blue and green channels on sunny days when something very bright is imaged.
They have narrowed this problem to images with a specific exposure time. This exposure time should be disallowed by the camera firmware, but the bug allowed it to be used. This issue exists in all firmware versions between 2.0 and 3.4.0. Specifically, the exposure time 1/6329 sec is not valid, and should have never been used by the camera. Other exposure times are not impacted (faster or slower).
Micasense have corrected this issue in the 3.4.1 firmware release which is now available for download in Atlas. While the behaviour when using this exposure time is undefined, Micasense have determined that the best approximate exposure time is 0.000274 seconds (274 micro-seconds) when 1/6329 is reported.
We are reviewing this problem and recommend to upgrade your firmware to the latest version to ensure that it does not affect your results.