A perfect reproduction imposes no transitions from light to darkness, any discernable transition would come from the nature of the subject and it's lighting alone.
If you see high contrast, but the transition from light to dark appears too narrow such that the fine smooth transition from light to dark is not discernable, I'd say look to something other than the lens.
Regards, Bob... ------------------------------------------------ "A picture is worth a thousand words, but it uses up three thousand times the memory."
From: "Boris Liberman" <[EMAIL PROTECTED]>
Mike,
Ability to render very subtle changes of light and shade. This in turn gives the image very 3D look. You almost feel like you're present on site.
This is what I would call plasticity.
The lens that is not like this has very few distinguishable transitions from light to darkness and back. So you get mighty contrast image but it lacks detail, lacks fine representation, lack this natural look.
Do I make sense?
Not sure what you mean by plasticity.

