The Nikon D3 – with its pioneering FX CMOS sensor and superb low-light shooting capabilities – was always going to be a tough act to follow. Nikon has taken its time, quietly working away to tweak and hone its flagship full-frame model to produce an even faster, fitter version: the new D3S. In the hand, Nikon’s latest pro model feels just as weighty and robust as we’ve come to expect from DSLRs of this calibre: it’s not something you’d want to heft around all day, every day without the proper weight training, but it is impressively solid, well-made and well-designed. The D3S is marginally lighter than th