Your eyes only do 13 f-stops
that sir, is totally wrong.
If you want I can explain, though it's a long explanation and very tough and time consuming.
It might be around 15 stops, but not if you consider lateral inhibition...that's one big "invention" of the eyes.
All is controlled by amacrine and horizontal cells in the eyes. In short: these are cells that run on the "lateral way", through the retina (and not retina --> optical nerve --> brain) and make connections between rod/cones and other "patches" of cones (usually are cones but there are connections also with rods) in the prossimity (and not) in order to tell something about this (think about if they were talking):
"you cones in point A are "seeing" X, exposed by X light....ok, but cones in B sees a different area Y exposed differently by Y light".
this is principle of adaptation (dunno if is the right term sorry) suitable also for the sense of smell. Eyes is even more complex but the main principle is that.
Think about it, when not on extreme conditions (for example the situation I'm right now) I have a big table halogen lamp but my room now is in almost total dark, I've in front a windows which is dark (no light) but the screen of the mac is thoroughly illuminated as well as the book I've in front of me. Though all around me would be completely dark. Now, if I look at the screen all around (the parts I'm not focusing...sorrounding area) is perfectly exposed, lamp is properly exposed as well as I see in the dark, almost perfectly (i'm still focusing on the screen). If I move my eyes into the darkness and try to "see", without actually focusing the screen, I still see it well exposed (maybe a tad bit more exposed) as well as the lam and the book.
That sir is lateral inhibition...if our eyes would have had "fixed" 15 DR you couldn't have such incredible adaptation.
Think about seeing stars, too....in these kind of situations DR of eyes is meant to be (not theorical by any studies) of maybe 10 times more (remember it's logaritmic the scale...)
there are not many but quite a few studies on this regards....unfortunately there's not much on the internet...I fortunately have it on my books so, I can haaaz the info eheh.
Eye is a very interesting subject and his values are far away than "fixed" values or principles...it's a very variable and adaptable organ (and we didn't even put into the equation the brain LOL)
anyway I could go on and on for hours but it becomes tough to read (patience) and too long and boring for many.
film has been measured at 10 - 11 f stops (film is analog, it can have measures like 88.73; digital can not)
digital is usually estimated at 4 f-stops
first part is very true but your statement of digital is totally wrong mate.
Not because I say it....just check the video linked on the page 1...and also the clarkvision link. these are the years where digital is overtaking film (fortunatly or unfortunately it's up to us)
the 4 stops DR might have been true about 6 or 7 years ago, but not anymore...facts, not my opinions.
Again, film does not have this issue; it can register a near infinite number of possible colors (your eyes often can not detect them) In fact, film's issue is LOSING Dynamic Range - it loses through the f-stop of the lens, the age of the film; etc. so it loses a total of 2 - 3 stops from what our eyes can see; Digital starts from the ground up with the basic sensor seeing only off and on
There is a "law of diminishing returns" going on here, as people no longer view images on reflective screen (slides, movies) or paper (prints) we are in an age where the limiting factor is screen accuracy and tolerance for detail - what is your screen;s real resolution and it's color response at that resolution and why should camera makers make images that have detail differences you can't see? Your eyes arfe estimated to make out only 10 million colors, so why try to process many more than that?)
I dunno if I understand it all correctly but I think I agree with you.
I mean what I understood and what i know is that, yes, film might also be 12 DR or 10...but in the end when you made slides they are maaax 4 DR...when you make prints they are about 5 or 6 DR and that's a fact.
BUT as for digital goes actually it's pretty much the same...meaning that if you print a dig picture again, you'll probably go down of about 5 or 6 stops of DR in the paper from the camera and already in the screen the DR has fallen...
if this is circa what you meant I completely agree with you.