The Firehawk actually has tiny particles of metal woven in. They are a bit afraid that these particles might dull or break off pins in the perf machines. They have to replace the pins about once a year, so towards the end of the life they were going to attempt it and see how it turns out. The pins cost a bunch (and I mean a bunch!) so it wasn't a gamble that they were willing to jump right off into.
I have a similar setup to what you are planning, except my screen is not microperfed. The D-ILA projector, even after calibration, will provide all the brightness you could want with the GrayHawk material. I really donâ€™t think you need the FireHawk material for any added brightness. Jeff I have about 27 feet of throw so 28 feet of throw should be fine with this setup. B.J. I don't remember the exact throw distance calculations but I think 21 feet might be a little short for a 12 feet wide screen.
For that size of screen at that throw distance you would definitely want to consider an ISCO anamorphic lens, it will expand you image to allow you to fit such a large screen with the throw distance you have. It will also give you enough brightness to move to a micro-perf Greyhawk with good ft-lambert levels. If I remember correctly Dean M. was shooting onto a 15' wide microperf screen with a G15+ISCO and had good results. You should be fine at 12' wide if you have an ISCO.
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