Found this online and thought I'd share it. Can't beat the price - FREE! Just print your film using the PDF they supply and follow the instructions.
I've printed it onto my film, but I haven't tried using it to test exposure times yet. The instructions are for vellum, but I don't see why it wouldn't work with anything. It pretty much looks like an 8.5x11 version of every other exposure guide that's out there that you would typically have to pay for.
Thought I'd post a follow up since I've now done my complete test and it worked like a charm. Probably could have just created my own exposure test, but this one does the trick pretty well and saves me the time of having to create one.
Pwhite20, What type of light source and wattage, and were you using film or emulsion? I will be using the Ulano E-Z Film. Thanks for any feedback you can provide.
...or try this Calculating Exposure Time
I suspect that calculating exposure to a vellum is more critical because vellum has a lower Optical Density and allows some burn-through.
Yes, but the object of an exposure is to crosslink the exposed bits of the screen to be insoluble whilst leaving the masked bits soluble.
If you have a solid mask with perfect contact it's easy, anything above the minimum will work. Once it's cross linked it won't become more crosslinked and the mask will obsure the open areas.
If you have an imperfect mask, that lets through a proportion of light, you will be gradually crosslinking the open areas and exposure time becomes important. If you use a vellum with a density of 2.3, which was typical when I was working on it, 5% of the light gets through, plus vellum is matted to scatter light and increases undercutting. The exposure is crucial and the exposure latitude, the difference between the minimum and maximum exposure times, is small.
With vellum it might be more important to work out the exposure time with the vellum than with an idealised mask. It's late and I'm getting confused with the maths, (and cabernet sauvignon).
dd2, I'm using a 1000W metal halide bulb with emulsion. I'm not sure what kind of exposure times you'll need for the Ulano E-Z Film, but I'd be curious to find out what you end up at after you've tested it. I've never used the E-Z film myself, but have thought about it several times for convenience reasons, and may just give it a try one of these days.
I ended up at 5 minutes on a home made lightbox with 15 watt /18 inch black lights. I was way over exposing the image thinking that my low wattage needed to be compensated with more time. Did the step test I believe you suggested and it worked like a champ. Thanks for your help and postings!!
Gentlemen. It's just a repeated test pattern positive to used when making a manual stepped exposure. Scott's is ready for printing, but any positive will work.
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How are you measuring? former Ulano Technical Support Screen printing since 1979 - SGIA Academy Member
Free Exposure Calculator 
