Ok, the testing is complete.
I did 2 things differently, 1) I used an ACK-E2 AC power supply and 2) I saved the image directly to the CF to eliminate any cabling/transmission issues.
I took a few different images with different ISO settings and exposure durations, here is one of them as an example.
- SW ED80
- Canon 50D
- ISO 800
- 1 x 600 sec
Vertical band = present
On the upside, I have contacted the supplier and they were more than happy to help me out
Therefore, in the new year I will be talking with them and Canon Aust to solve this.
Michael