I think low light performance depends on your camera body as well. Works great In low light on my 6d and 1dx. The last 2 pics of the 1.4x extender box was under my table and very dark. ISO 12800 shutter speed 1/20. That should let u know how dark it was. AF achieved without issue.
Hi, would like to know which extender you are using with this Tamron lens? I tried with Canon 2X II which autofocus not working. It keep trying to focus but can't get it right, also I found that F stop not change to F5.6.
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