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Ah yes, the Sigma 100-400 --- we are using this at the moment, and well, the size and weight is fine, can't complain there. Of course there is a but here, so it does fine-ish in good light, but any backlighting or poor light and the IQ just plummets. Dramatically. Where I usually expect to pull detail or recover something from the shadows there is just a dark blob. I have not seen this before in any of my Sony lenses; whilst I may bodge an image with backlighting, I can still usually get some texture or details back from it. Indeed, this has been so good with the A7/A9 that I have evidentally taken it for granted as being some kind of norm!