I have several mass market type condenser enlargers (Bogen, etc) and sometimes use a cut piece of plastic 'ground glass' in the filter drawer to fully diffuse the light coming from my ph140 bulb. Where do I buy more of this material? Or are there alternatives?
I was thinking about art supply stores stocking pliable sheets of diffusion material. I have tried tracing paper but the problem is the presence of detail in the paper: when I stop down the lens to f22 the detail becomes partially in focus and slightly visible on the baseboard. I need a material that is strictly homogeneous throughout. Again, the ground glass (glass or plastic) serves this purpose.
Please state sources for either of these two materials if you know of any. Also, do you have further suggestions for what should be a very simple conversion (with the only drawback being increased exposure time)? - David Lyga