I can understand negative expansion when in low contrast situations; but still don't understand the need for neg contraction.
The idea behind the zone system (contraction in this particular case), is to try and match the negative scale to the print scale as best as you can to minimize the printing acrobatics you will have to go through to achieve the print you visualize in your mind.
In the darkroom, you are more or less compelled to adjust contrast in the printing stage until midtone local contrast looks pleasant. Then, highlights and shadows are shoved onto the paper as necessary with D&B. In gloomy, low-contrast lighting situations, developing more will never separate local tonal values sufficiently and you will still have to increase paper contrast for midtone separation, the result being that you only end up spilling the absolute highlights and shadows off of the paper.
...How are you guys exposing your sunlit photographs? Are you placing shadows on zone II? Maybe placing highlights on zone VIII? Reduced agitation in development most of the time?...
Not necessarily. The Zone system the way Adams describes it in his book is clearly not intended to make printing easier; it is designed to leave as many printing options open as possible, which may make printing rather hard indeed. Adams himself states that he doesn't intend that a 'Zone systemized' negative will print easily, only that it will contain the maximum amount of information possible.
That is just a different way of saying the same thing. Trying to make a negative that more closely matches your desired print scale is the same as making a negative that gives you more options. It will take a little less work to get an "informative" (as Adams would call it) print, and that in turn means you have more flexibility to achieve your visualization. It doesn't mean you're going to make straight prints. It just means hard work might get you closer to your goal (or maybe a few less hoops to jump through to get there).
Sure you can make a good print but it can't have the same dynamic range as the subject did. You may be able to give the impression of great brightness range if you are a good enough printer but you can't replicate it since the paper is incapable of that. So it comes down to printing skill because a straight print will never do it.
Exactly, so what is the printing skill required to give the impression of brightness that was in the original scene?
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