Originally Posted by mark haflich
I am clueless about painted screens. As a general rule with favric screens, at leat white ones with gains, the minimum throw ratio is that of the screen gain. Thus, if a screen had a gain of 1.3, the minimum throew should be 1.3 to avoid hotspotting. I think your paint is a gain of 3/ god help you in your current choices of throws. I would go to the longer of the two. Good luck. And if you don't know what hotspotting is, do not try to learn what it is. you will be happier in the long run. Enjoy your new projector.
Ha! "..do not try to learn what it is.." Good stuff Mark! Makes me laugh as I recall my recent anxiety over the whole "sub pixel shift" discussion you guys have been having here! Unfortunately, I read much about hotspotting as well before going this DIY route on the screen although I will TRY to avoid looking for it while watching movies! The old saying of "Ignorance is bliss" probably holds true to some degree.
If I am remembering correctly, the Silver Fire v2.5 3.0 formulation is a 1.3 gain. So I apologize upfront for my ignorance but when you say if the gain is a 1.3, the min throw should be also 1.3. For my 107" wide screen, that puts a minimum projector distance about 11'7". Following that, then my 12'8" option is ok? And more importantly, preferred to the longer 14'3" option?