New to photography… I have just bought a Nikon d7200, with a sigma 18-35mm f1.8 lens; I had also purchased a Nikon 35mm prime, 1.8, but sent it back because I realised that I have already covered this focal length with the sigma. Shall I get a 50mm instead, which will be around 70mm on my crop sensor camera - looking for a portrait lens and something more naturally suited to shots that mimic the human eye. In advance, I thank you for all advice given.
I can't tell you what lens(es) to get. But ... you can't really replicate the human eye because you may get the lenses but not the processor (the brain) behind them. My experience is we see a lot wider than most lenses but then we tend to focus on what interests us ignoring everything else around it until we scan the wider picture again and focus on something else. With a lens that is as wide as you see, the interesting bit ends up being tiny and probably ignored. Having said that, all the lenses have their uses as when you get the right photograph the interesting bit from that wide view will be there (else the photograph will not be that good).