Depending on the paper, the blend of coffee, (and the wind direction, it seems

) a Caffenol print can have anywhere from light to heavy staining, even tones to wild, surreal splotches. The effect is quite unpredictable. I will have some nights where nothing seems to work, and others where it feels like magic. I've got an article on the process here:
http://tomoverton.images.googlepages.com/caffenol. Most of the pictures were taken with my Rollei, but a few were with my N80.
Note: many people will say that coffee is not a
proper developer, or that it is a
staining developer, rather than a toning developer. It does, however convert the silver in the latent image, so in my opinion it is a viable alternative process.
Mark, your Rolleinar blog is spot on. They really did it right when they manufactured these lenses. I use the Hoya close up kit on my SLRs and they are really limited in what they can do. The Rolleinars are sharp, sharp, sharp.
Great work.
Tom