Originally posted by pingflood I know you usually can back your statements up, so can you find a reference for this? To the best of my knowledge good color film resolves a good bit more than that (55-60 lp/mm).
(edit: unless you are talking about system resolution in which case 40-something would be on target.)
Well, that was from my memory.
Sources (Leica LFI 3/2001) for best Black&White talk about (Kodak Tech.Pan) 320 lp/mm max. and 100 lp/mm at 50% MTF. Gigabit film and Kodak Tmax 100 are the same for 50% MTF but Gigabit film can be 600 lp/mm with 5% contrast.
As for color, sources are less reliable. Agfa specified all MTF curves and published (Agfa Technisches Datenblatt F-PF-D4 07/2003) figures (for 1.6:1 MTF) of:
50 lp/mm: Agfa Scala 200x, Agfachrome RSX II 100, Agfachrome RSX II 200, Agfacolor Optima 100, Agfacolor Optima 200, Agfacolor Optima 400
55 lp/mm: Agfachrome RSX II 50
60 lp/mm: Agfacolor Portrait 160
The above document publishes complete MTF curves and can be expected to be accurate information.
This online document (
http://cool.conservation-us.org/coolaic/sg/emg/library/pdf/vitale/2007-04-vi...resolution.pdf) quotes the following for 30% MTF:
Kodachrome 25/64: 50 lp/mm
Ektachrome 50: 40 lp/mm
Ektachrome 160: 35 lp/mm
Fujichrome EI 100: 45 lp/mm
Fuji Velvia 50 RVP: 80 lp/mm
The same source states that the effective resolution including lens and film transport is lowered by 30-80%, in particular turning 50 lp/mm film resolution into 33 lp/mm when scanned.
I think 40 lp/mm is a fair summary of achieved resolutions during the film era, knowing that the combined use of exceptional film (Velvia, Tmax 100), outstanding lenses (Leica, Zeiss, some Pentax) and extreme care in the setup (camera calibration etc.) could yield 2x better results. At the same time I know that most people, when scanning their film archive, achieve much worse results ...
And I have no reason to believe that the IMAX film capturing workflow was on the exceptional side of things. Which is why they used such a huge frame size to start with