Originally Posted by Dave in Green
Unless I'm missing something the whole concept of using spandex is based on the notion of having a relatively simple way of producing a DIY acoustically transparent projection screen at a much lower cost than using specialty AT screen fabric.
That is a bit of a myopic a view point...especially if one can remember that Spandex found a home on AVS first as a lightwieght, easier to work with Screen Material all the way back in 2002. The "AT" consideration really only came around once the "snobs
" over on Screens found that the overall
Image Quality was in fact superior to ANY of the Mfg AT offerings available up to just recently (V6) Afew actually decided to test Spandex combinations and in doing so, embraced it as a viable alternative.
Setting aside acoustical properties and only considering image quality spandex brings up all kinds of issues and questions. First and most obvious is that it has texture, even though it's a very fine texture due to the tiny voids between the fibers that can be seen up close. The best lambertian PVC screens are perfectly smooth with no texture and no voids.
Now Dave, that's just silly. How "up close" do you watch from? 12" ? For all intents and purposes Spandex Milliskin has NO
discernible texture from a viewing distance of +3' for those with Lasik vision, and -2' for us "normals"
The best PVC screens have opaque black backings that allow no light to leak through to the back wall. A black layer of spandex behind a white layer also has voids allowing some light to leak through.
If the purpose of having black spandex behind white is to create a grey screen then what would the advantage be over two layers of grey spandex creating the same negative gain as white over black?
1st off, the purpose of the Black underlay is to sharpen the image....just as it does with other Mfg AT materials. The slight "Graying" of the screen is just a side benefit that provides very modest ALR properties, as well as help deepen Blacks overall. Gray on Gray or Gray on Black would further reduce Gain and affect White / Color reproduction. White over Black enhances Black levels without affecting White and Color appearance beyond the lessening of Gain from a lambertian level.
Assuming some combination of spandex could match the image quality of pefectly smooth, color neutral and lambertian PVC, the only potential advantages of spandex that I can see are that it might be lighter weight, easier to work with and less expensive than PVC.
Really, did it take all of the above to get around to what most any/everyone considering Spandex has already learned?
The entire DIY Screen Forum
premise from the start was that Spandex isn't a true "Mfg Screen material". Only up until recently have the Moderators allowed for "Mfg Screen Materials" that do not come complete with a Frame to even be mentioned let alone recommended. Even beyond that, on the DIY Screen Forum
, if in a pinch DIY cannot suffice, inexpensive Mfg Screen options are suggested. Yeah...we still see Mfg Screen advocate
s come over here to trash true DIY applications...but gee, you never see the opposite happen on Screens.
Only now recently has Spandex found a occasional Home on a Thread over there. It doesn't get the respect it deserves though..........
This all adds up to the main question: Although there may be a few cases where some individuals may prefer the visual properties of some combinations of spandex under come viewing conditions over some types of PVC is there any definitive evidence that this would be the case in most situations so that spandex would be the preferred screen material over PVC in cases where acoustical transparency is not required?
Yeah......it's easier to work with, lighter in weight, and costs less, while also delivering an exceptionally clear image with no artifacts, hot spotting concerns, or viewing cone issues. There are few people doing DIY screen-making who are not looking for "easier and less expensive", and if a portable, lightweight Fixed Screen is necessary, Spandex often gets the nod as of late.
Oh my....did we already cover that ?
Unless there is a decided attempt afoot over there on Screens to embrace Spandex as a bonafide "Screen Material", I'd think this would always be conversation best suited on DIY Screens.
But then again...since AVScience
has started a Thread on DIY Screens
about the Mfg V6
material, and even gone as far as to highlight it's advantages over Spandex right in our backyard, and some have even gone so far as to suggest Spandex Screens over on Screens
, it seems somebody has let the dogs loose in both backyards.
If it all can be done without the "Screen Wars
" we had to deal with between 2004 & 2010 (...and resulting in the split that created DIY Screens
...) then in truth, there can be more choices available to all, across the board.
But somehow that seems unrealistic, because from day one, those who opt to spend more based on no interest in DIY, or feeling DIY could never compare with Mfg, they have always haunted DIY threads and filled them with...well let's just say it's never been pleasant.