I never used the Gocco screens for photo images, but they seemed to me to be be pretty open screens for any type of detail. I used to print on larger screens using Hunt/Speedball photo emulsion and a blue photoflood for exposure, or even a large light table )with the plexi replaced by clear glass)- 17 minutes was about right, as I recall. I don't remember the actual thread count I used––haven't done it in a dozen years or so. The results were litho-like since I only used a basic half tone screen to make the photo transparencies. Good for printing on cloth, but not very detailed, even with the finer screens. There are a lot of trade-offs and adjustments necessary for more detailed work, but it's possible.