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Hi, I would like to give you my take on this question, I owned the Sony 100-400 and it was indeed excellent in all respects but even with the 1.4 converter it just did not give me the reach that I required, I had read many conflicting reports about the Sigma 150-600 on Sony cameras so I decided the only way to tell if it worked or not was to get one and try it myself, to minimise any loss should it not work I bought used, the lens, Mc-11, the dock, and a 1.4 converter were all bought used at a considerable saving, with everything including my A7111 updated to the latest firmware I found it worked very well indeed even with the 1.4 which surprised me, I was happy enough with it to sell the Sony lens and I have not regretted it, I should emphasise that this is with the A7111 on latest firmware I know this will not apply to all the Sony models, the Sony lens is sharper and the AF is quicker but the difference is small, my conclusion is if 400mm is long enough or indeed 560mm at F.8 go for the Sony you will not regret it The Sigma I bought is the sport version and the only downside I can find is that it weighs as much as a small car, no doubt some one will be along soon to tell me how wrong I am but this is my experience.
Thanks for your take on it, I do appreciate all opinions.
My initial steer was to the sigma 150-600 sport. It is for use on my A7R3, so the camera is up to spec for it, it is the weight of the sport that bothers a bit, at 2.7kgs, whereas the sony is 1.4kgs.which is a sizeable difference!