5D MKIV banding issues with firmware version 1.2.1

[bwanaboy]

Just updated my firmwar to 1.2.1 and noticed 2 green bands (1 at the top and 1 at the bottom) of a long exposure (15 seconds) photo. Milky way photo was shot in bulb mode with 15 second exposure using a 16-35 2.8 L lens. The reason I updated the firmware was of a known issue with red wisps in photos with long exposures in bulb mode. This problem went away with the firmware update but has been replaced with the green banding. Please advise if anyone is experiencing this. Is it a known issue and can it be corrected?

[Peter]

https://community.usa.canon.com/t5/EOS/EOS-R-long-exposure-banding/m-p/315510

If you want you can send me a raw file. No need to convert it to DNG. Atis was happy with the result from EOS R.

[bwanaboy]

Hi Peter - Thanks for the reply. I will send you two photos one before the firmware update and one after which is the one that shows the new issue. I bring these photos directly into Lightroom to make my adjustments. If change the exposure you will see the banding. The photo before the update will show the red wisps and the reason for updating.

[Peter]

Raw files please. I know about the red thingy and why you had to update the firmware. I have sent you some M6 raw files. Hope you like them.

[bwanaboy]

Thanks Peter for your assistance. Greatly appreciated!