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The D750 has nice detail but a D850 is a quite a bit crisper at 100% on screen. If you have the budget you wouldn’t regret a D850 just bear in mind at least up to A3 print you really can’t tell the difference
Likewise, however I wouldn't want to print too big with these files.
The error with this scenario is that when the larger pixel drops to 1 photon the two smaller pixels would not both drop to 0. One would drop to 0 and the other would record the 1 photon. The one photon is still recorded and minimum EV is still retained. Plus, it is more accurately placed w/in the scene. The main increases in DR have been from reducing system noise, which reduces the minimum signal required to be discriminated.But consider the situation where the EV is 15 stops lower. Instead of capturing 2^15 and 2^16 photons per pixel respectively, the two sensors now capture 1 and 2 photons per pixel respectively. To my mind that says that the small-pixel sensor has reached its limit - one photon is the minimum which cave counted and it cannot record faiinter scenes. However the large-pixel sensor can discriminate between 2 pixels and 1 pixel, and it can keep going down to one more stop of EV. In other words, it has a greater dynamic range.
Depending on the monitor, 100% view could be equivalent to looking at a 3m wide print from less than .5m away... not a lot of value in that.The D750 has nice detail but a D850 is a quite a bit crisper at 100% on screen. If you have the budget you wouldn’t regret a D850 just bear in mind at least up to A3 print you really can’t tell the difference