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p.4 #2 · p.4 #2 · Leica M10 and M10P: Stay way from ISO 100 in contrasty lighting  
airfrogusmc wrote:
I agree with almost everything except the words process was greater than the final product. For Adams the process was to get him to the final product. To consistently capture what he saw in his minds eye at the moment of exposure and getting the final print of what he saw at that moment he exposed the film.. That means controlling the entire process to get exactly what he envisioned the final print would be. That is the reason for the zone system.
Yes, he understood his previsualization and the interim steps to getting him where he wanted to be in the end.
In much regard, the process of the zone system, etc. is an algebra equation ... where you know the end, and have multiple variables on the other side of the equation to be figured out regarding their influence on the final product.
We have variation in available illumination, and in the subject's reflectance of that illumination (hue influenced also). That's the starting point. Combine that with the fact that not all areas of a given scene may be receiving the same levels of illumination and yes the "math" gets a bit trickier. So, knowing where / how much one might want to move things in postcapture, influences where one might want to start on the capture ... thus the "system" to aid with the math of working it backwards from the finish to the start.
All aspects of photographic luminance values are rooted in the physics and math of light. Folks don't want to do the actual math, so systems are developed fstop, ISO, Zone, etc.
So, where lens A has different light transmission qualities from lens B (back to the OP) ... yes, the amount reaching the film plane may yield a different starting point. So, an adjustment in our capture exposure may need to be made for those variables, since there are limits (01) that can be reached, and the mathematic operations we have for achieving them as a final, may require more "finesse" than is typical.
The values we start with, and the manipulations to those values determine where we wind up. So, it's a math puzzle ... both conceptually, and literally. And within our realm of operations lies A + Bx + C^y = Z. Some manipulation aspects are linear (A), others are multiplication (Bx) and some are exponential (C^y). In certain regard, the processes we employ in our postcapture manipulations influence where we may want to start from, as well ... as well as how we approach / combine those operations.
For most folks, they find a combination that "works for them" and then pretty well stick to it. Sometimes, a given combination may turn out to not be ideal for everything. Since we don't all adhere to the same approach, we're gonna have variation in what works / doesn't work for different scenarios.
Long story, short ... more than one way to skin the cat.
