even if we call raw monochromatic, which is absurd, monochromatic or grayscale images still have bits per channel, it's just one single channel :-]

of course film photography can have shades of gray, it's just that magnifying this gray reveals it is made of film grain

so, moving on to your example, in CRT the input signal of 0,5 ("half brightness") gives the archetypical ;-) 18% light intensity (technically it's more like 21%), but we perceive it as "half" because that's how our vision system works. remove all photography, silver halide, cmos, crt and stuff and our eyes still see 18% as about 0,5 intensity. this is about biology, not technology.

that's not only factually incorrect, it's illogical. we can't say that all nonlinear phenomena magically match each other just because it sounds great. the behavior of film photosensitive molecules in the saturation region decreases the sensitivity resulting in a gradual overexposure (log-like response). fine. but if you want to explain the CRT nonlinearity by saying that phosphor is "exactly like silver halide", the response would diminish with increasing signal, which is exactly the opposite of what happens in reality. CRT response (and sRGB nowadays) is exponential and not logarithmic.

nice story, too bad it's not true :P film response curves differ, but the main, most important section is mostly linear. after all, the typical goal is to reproduce the original view rather than create special effects. yes, the "saturation" section becomes log-like like you described, but it is not what we normally use. either way, all this is completely unrelated to the "18% grey". because "18% grey" is perceived as "near half brightness" even without any image capturing device, e.g. in camera obscura or just a live view.

can bullets kill people when they are sleeping? ;-)

the question was not whether tilt shift lens are useless, but if purely optical techniques become less advantageous. and YES, they do, because the high resolution sensors used with the same lens will inevitably produce more blurred images (at the pixel scale) than low resolution sensors. this means the quality is less affected by the reprojection and interpolation. or, in other words: the interpolation affects mostly the highest frequencies in the image, so if the frequencies are lowered, the image quality is better preserved.

panasonic says they can imaging-resource.com/PRODS/panasonic-gh4/panasonic-gh4TECH.H‌​TM

btw. according to google, bracketing is "wrong" and capturing a lot of snapshots at the same exposure settings gives more detail and allows for better registration, and this is what they do in their recent phones. dpreview.com/news/4324089912/…

@ths please explain. the blur is exaggerated deliberately in order to demonstrate that chromatic aberration is not just color fringing. in fact, it even shows up in b&w photos, with no colors at all.

might be, however in this photo white balance seems to be adjusted for the stone blocks in the foreground

@MichaelC yes, it is visible to the naked eye!