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When I use my 5d3 in AI Servo mode, continuous shooting, ISO >approximatelly 1600 and with my Tamron 70-200 VC, 1 out of approximatelly 15 photos has banding in lower part of the photo (or upper part of the sensor) by lanscape orientation. VC has no influence.

 

I tested my lens with 4 different canon 5d3 cameras (1 is mine and other 3 brand new cameras in 3 different shops in Stuttgart), and I test also 1 brand new tamron 70-200 on my camera. In all cases I got the same problem: banding lines in lower part of sensor yby landscape orientation. I also tried my lens on my old camera Canon 550d and I did not have this problem in that combination.

I did not notice this issue with other lenses.

 

Crop of the example photo: http://i1225.photobucket.com/albums/ee39...zfjnpw.jpg

 

2 RAW files in landscape and portrait orientation: https://drive.google.com/folderview?id=0...sp=sharing

 

I use Lightroom 6, but I also checked this issue with DPP and it is the sam thing.

Both, Canon and Tamron in telephon conversation told that the problem belong to the other side, but they also told to send camera/lens to check it.

 

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After some testings and researching in the net, the most possible scenario to me is: AI servo force USM motor continuiusly to run. This causes continuous RF radiation. USM drive is on the upper side of the lens, the banding is appearing on the lower part of the photos, i.e. on the upper part of the sensor, means on the same side as banding. Due to any reason camera/sensor/processor are not capable to handle this RF and this is causing banding...

 

As fare as I am concerned, this is system failure of  canon or both....this problem was common for canon EOS 5D with canon lenses, with 5d3 this is happening only with Tamron 70-200 VC....as already told, I tested 2 lenses on 4 cameras with the same results/failures....

 

i send both pieces of equipment to the corresponding services with identical sample RAW photos and with identical description...completely transparent and politically correct now i can only wait to see what an answer i will receive...

 

Do you folks have any comment or an idea what can I undertake in order to overcome this issue?


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