I see pics with deep rich blacks but I myself cannot ever get enough darks and blacks in my images. This user has alot of images like this: http://www.flickr.com/photos/moonchild1111/ I also see it on my favorite pictorial images. Vignetting and color filters can help but I cannot believe it comes from increased contrast - the images I speak of have light highlights and a very smooth tonal range. My last roll on my Rolleicord was overexposed. As I read the Zone System I am thinking some form of +/- exposure with +/- development could work, so that is my next test.