Quote Originally Posted by guitstik View Post
I don't see why they couldn't use direct positive paper instead.
I enthusiastically bought some Ilford direct positive paper when it came out.

I found it very difficult to control - it has very high contrast and strange reciprocity characteristics. The contrast seems almost proportional to the exposure. Long exposures usually produced soot and whitewash effects and since it was slow, short exposures were only viable with flash.

I managed eventually to get a workable regime using pre-flashing and a low contrast developer, but I found it a difficult paper to use and the method had little flexibility.

Paper negatives on the other hand are quite easy, with the ability to control exposure and contrast at both the negative and positive stages, so even with the ability to obtain positive paper and with the cash to buy it - I would personally prefer a paper negative in my Afghan camera.