Can I take it as scientific fact that HP5 r D400+ pushed to 1600 is bound to be more grainy that D3200 at 1600? Is there a scientific test that proves this and if so can anyone point me to it?
Thanks
pentaxuser
More than grain, which has a smaller relevance, it's tone what matters first.
For sure the tone of D3200 at EI1600 is much better than the tone of both ISO400 films at EI1600. But that's not very important because nobody forces us to use ISO400 films at EI1600 exclusively: at box speed their tone is perfect.
Of course apart from better tone in all soft light scenes, only D3200 -thinking of films at EI1600 alone- can be used for direct sunlight scenes with clean shadows.
So the decision depends on three facts: first, if we want the chosen film to be good for every day photography (OP), second, if we want the film to be able to produce good shadows when there's high contrast or if we want it for soft light only, and third, if we'll push to EI1600.
IMO the best option for decent grain, common photography, sunny scenes, overcast, and ocassional EI1600, is HP5+. It's the most versatile film in the world.
Delta3200, especially in 35mm, has a type of grain that's not for everything. But for sunny scenes with the fastest possible speed for DOF/shutter speed handheld, and for tone at EI1600 alone, D3200 is the one. We pay with grain.
At EI200, and if we'll never uprate, the best option seems to be D400 in Perceptol.