Sweet Creek Falls, Oregon. X-H1, Viltrox 13mm F1.4, Acros.

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I think my Fuji 150-600 F8 is a brilliant wildlife lens in terms of sharpness, portability and value but the small aperture does cause issues at the start and end of the day - even pushing the ISO as far as I dare, I can see shutter speed down to 1/25s - stabilisation isn't an issue but asking a deer to stand still for that is too much! In the same situation, an F4 would give 1/100s so the difference to the success rate would be phenomenal... and that's without the other improvements like shallower depth of field. I also find that the Fuji's subject detect AF gets pretty iffy in low light - I keep updating to the latest firmware but it doesn't seem to get any better. I was originally looking at the Nikon 500mm F4 E but good examples secondhand are still reasonably expensive but like-for-like Sigma lenses are around half the price. Reviews I have read suggest that they are as good optically, AF performance and IS-wise but you gain a few hundred grams of weight (but less than the older Nikon model). For a couple of grand, I can live with that. Does anyone have any experience mounting one on an XH2S? What about with the 1.4 teleconverter? It feels like that is pushing it anyway - hefty lens + TC + Fringer all sounds a bit...wobbly? It is on the Fringer approved list but I am wary about AF speed in particular. I had also considered looking for a used Nikon 400mm F2.8, which would be even faster (and heavier) and could couple with a TC to give 560mm F4 but again, it is that lens+TC+Fringer combination that worries me as being just too many links in the chain. Of course, what I really want is a native Fuji prime but that doesn't seem to be on the horizon - and if you look at what Nikon and Sony are doing, if Fuji do ever bring out a 500mm prime, it will probably be a small, light and cheapish F5.6, which is only 2/3 stop better than my zoom at the same focal length. Any thoughts anyone?

The Amazon link is an annoying feature of this forum - its automatic and is applied to every post for advertising purposes. My question was - how do you know the camera wi-fi is on and requires turning off? I would have thought this would just use up the battery for no purpose if you aren't specifically using a function that requires wi-fi.

I've made a point to push Angelbird memory products as they are the best performance cards you can get, The sustained write speed is important.

Thanks for the replies everybody. But unfortunately that Amazon link says nothing about how to turn off the Fujifilm X-T20 WiFi signal receiver. I just want to know if there IS an option to turn it off. Otherwise I'm going to have to resell this beautiful camera and go back to a (lightweight) Nikon DSLR, such as the D3500 which I understand has very well behaved IQ results.