I do some screen printing on t-shirts from time to time. recently I decided I wanted to try making some shirt prints of my photography. I figured the new 4x5 material would be a great source for that. After a bit of reading, I've learned that the way that they used to convert negatives into half tones for printing in newspapers involved copying the negative using a special screen. Does anyone know if those screens are still produced, and where I could find them? evilBay doesn't have any right now, at least not under the keywords "half tone screen".

Additionally, is anyone familiar with this process? I'd like some advice/pointers going in, if anyone has any to offer.

I know I could just digitize the negative, use PS to change it to half tones, and then print on acetate, but where's the fun in that?