Dominik Muench Posted May 23, 2005 Share Posted May 23, 2005 this is the characteristics curve of the black and white reversal trix from kodak. do i interpret that curve right that this stock has a latitude of around 2 1/2 F stops ? Link to comment Share on other sites More sharing options...
Dominic Case Posted May 23, 2005 Share Posted May 23, 2005 It's hard to read this curve accurately (thanks, Mr Kodak:-( ), but the curve reaches from about -0.5 to -2.2 on the logE exposure scale. (That's not all straight line, it includes toe and shoulder gradations. What that means is that the film has a useful exposure range of about 1.7 logE, which is just under 6 stops. I don't like to use the term latitude for this: latitude is really how much you can vary your overall exposure for a certain set-up, and get away with it. In a 6-stop (64:1) ratio scene, you have zero latitude with this stock. Anything with a greater range, will be crushed or burnt out. I don't have much (any) experience with the new Kodak b/w reversal stocks, but the curves published on the Kodak website are so dramatically different from the older stocks that I hesitate to draw any conclusions. Perhaps John could elaborate a little more. Link to comment Share on other sites More sharing options...
Dominik Muench Posted May 23, 2005 Author Share Posted May 23, 2005 thanks dominic, so how do i have to convert those LogE into f stops ? Link to comment Share on other sites More sharing options...
Premium Member David Mullen ASC Posted May 23, 2005 Premium Member Share Posted May 23, 2005 thanks dominic, so how do i have to convert those LogE into f stops ? <{POST_SNAPBACK}> Just like the ND filter series, every .30 logE = one stop of density, right Dominic? Link to comment Share on other sites More sharing options...
Sam Wells Posted May 24, 2005 Share Posted May 24, 2005 What that means is that the film has a useful exposure range of about 1.7 logE, which is just under 6 stops. I don't have much (any) experience with the new Kodak b/w reversal stocks, but the curves published on the Kodak website are so dramatically different from the older stocks that I hesitate to draw any conclusions. Perhaps John could elaborate a little more. <{POST_SNAPBACK}> I haven't shot this one either but lots of the previous Tri-X and I'd say 5 stops (maybe a touch more) was the useful working range..... -Sam Link to comment Share on other sites More sharing options...
Dominik Muench Posted May 25, 2005 Author Share Posted May 25, 2005 hui confusing but i think i got it :) 5-6 stops latitude sounds great. Link to comment Share on other sites More sharing options...
Premium Member John Pytlak RIP Posted May 25, 2005 Premium Member Share Posted May 25, 2005 The Kodak website has a tutorial about basic sensitometry and tone reproduction: http://www.kodak.com/US/en/motion/support/h1/structure.shtml Link to comment Share on other sites More sharing options...
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