markbarendt
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Wait, don't make it too easy. I still haven't figured out the puzzle...
Okay
So using the method for determining CI found in Kodak's Sensitometry Workbook the curve used in the examples has a CI of 0.58. Close as I can tell.
The placement of the zones can be determined by the paper's range, if the papers printable range is 1.05 then B should print the zones as expected and A would end up clipping.
Am I missing something with regard to the paper's characteristics?
And I still don't understand how one can interpret or apply CIs without knowing how they were determined. What points are chosen along the curve, for example. In any case I'm just along for the ride and enjoy Stephen's posts.
I'm familiar with the Loyd Jones quote and the wheel used to pick a paper grade for a negative. Of course it is imperfect. The wheel can suggest a grade - then when you go to print, in the end, pictorially and psycophysically you might go up or down a grade, or burn or dodge to make the print look right.
Wait, your negative A is 0.61 CI which is really close to the prescribed 0.58 CI for a 7 1/3 stop subject brightness range onto Grade 2 paper. Yet paper B shows the resulting negative range of 1.35 would stink for Grade 2.
Is the bottom line then?... The reason 0.58 CI is Normal on the CI charts for Grade 2 and 7 1/3 stops is because you will NOT get a 1.35 negative range (because of flare and optics). And that still it is OK to exceed the LER 1.05, (guess maybe you really get 1.15)?
I hate to say this, but over the last 60 years or so, I have known literally hundreds of "famous" photographers and truth to tell, not one of them used the zone system to my knowledge. And, when it gets down to it, the zone system is a reduced form of Densitometry and Sensitometry. Nothing more than an H&D curve with a glorified name.
I've said this before in other posts. Sorry. I probably should not say it here and I will take a lot of heat over this.
PE
Man this zone system can be complicated to hell n back with equasions n mathamatical terms. We're artists not scientists, we don't add 2+2, we count fingers or F stops!
50 years of using the zone system, I've ledarned that the oversimplified version makes more sense. I was always told, as many of us were, by an old photoggrapher friend...
"Expose for the for the shadows, develope for the highlights."
I think we've all heard that one before and it's right on the mark, it's called the Zone System.
Ron, thank you. I'll have your back all the way on this. They are really the same but just use different terms; they both use the same physics; therefore they both should equate.
As the level of frustration seems to be rising, I would like to remind everyone of a few comments I made in an earlier post. The question was about the "correct representation." I could also have said correct presentation of the facts. Remember, both curves are identical and represent a 7 stop luminance range.
I also said "the key is in the interpretation of the data, and a large part of that is having a good grasp of certain principles and asking the right questions." This thread is about the importance of interpreting the testing data. It's not about one system being better than the another (as they are basically the same). I'm using an apparent discrepancy as an example of how problematic misinterpretation of the data can be. And the misinterpretation of data is usually the result of not being aware of and not factoring in all the variables involved.
Man this zone system can be complicated to hell n back with equasions n mathamatical terms. We're artists not scientists, we don't add 2+2, we count fingers or F stops!
since you've done the tests you know what the Normal N, N1 N2 N3 and N-1 N-2 N-3 times are so you don't block up the hightlights. jot down the N reading and it all falls into place as expected.
What I'd like to know; are Democrats better photographers than Republicans?
It was a joke. There's a current movement with right wingers deigning science.
Why the ad hominem attack? Debate the issues using facts. If you can't, don't stoop to personal attacks. It's bad form. There's still time to delete your post.
Stephen, right on. ya see, if you practiced long enough, and learned to listen to others with an open mind, you too will be able to one day not have to over think this minutia as if it were a religion.
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