Originally Posted by SpiderWire
Hello Spider! Wecome to AVS's DIY Screen Forum. We all hope you'll continue to hang around and bug us. Just don't bite.
I am from South Africa and this forum has helped me allot so far.
If I am posting in the wrong section please let me know and my questions might be very stupid but I have no clue what some of you are taking about.
Your where you need to be.....but be comforted in knowing that sometimes we are just as clueless.
I have read several posted and used the DIY beginners guide to get and idea what is needed to build my first screen. Well as the days gone by I have read more post and at this stage I am so confused about all the materials and paint that I thought it might be better to get clarity.
Clarity on info / advice is always good, and absolutely essential as far as how good your image looks as well. You don't want a fuzzy image.
My projector is a OPTIMA HD23
A nice bright PJ. It does have some considerations. It has no Lens Shift....a short Focal / Zoom range (...just over 2') so placement as far as distance from the screen for a given size is limited, and a 12" image offset.(your PJ Lens must be 12" above or below the Top or Bottom edge of the Screen.
And my frame up to now, I will put the braces in during the week.
I have read some where that you need to calibrate the projector to your screen? How would I do that. Or can I just set it to cinema and don't worry about all these fancy stuff.
The need to calibrate is wholly dependent upon several important items.
1. Screen Color & Gain
2. The quality of Color / Contrast settings "Out of the Box" in an / all of the various viewing Modes.
3. Room viewing conditions.
To calibrate you use one of several available Calibration DVDs. The most popular and easy to use one among NOOBs is the Disney WOW Disc
Then there is BOC that needs painting and that was my plan in the beginning to paint it a gray shade as my room is not a dedicated theater room. But after reading more on the forum I see you can use Spandex material in gray color. Do I then first put the BOC over my frame and then spandex. If I can skip the paint then it would make my life so much easier cause to find the correct shade of paint in our town is not going to be easy.
Spandex has become quite popular as of late, but it's use is dependent upon matching the Color / Type of Spandex with the Room and PJ selection. You can...and should use a double lyer approach, with either a White or Silver Gray backing behind a White or Silver Gray screen surface. You would wrap / stretch the Spandex across your Frame "as is"...you need not back it with another material, although that is an option.
Just one last question.
Yeah...riiiiiiiight. We've all heard that one before.
I see lots of people talk about +1.0 gain material??? What is that and do I need to worry about that. I still want the best DIY screen I can build but all this technical stuff make my head spin.
See Ya On The Wire
Gain levels represent how much of the original brightness of a projected image is retained and how it is directed back to the viewer.
A - 1.0 gain surface will reflect all light received back to
B - +1.0 gain screen will, as the gain level rises, direct a ever growing percentage of the light received back on a axis (direction) more centered on the viewing position. The highest gain screens effectively narrow the returning light down so tightly, when viewed directly in front of the screen, the image might seem to have gained actual lumen. But it is really a case of focusing light down to a smaller point, much like a adjustable Flashlight...or even better still it represents the same pirinciple as that behind a Laser beam. The tighter the beam, the more apprently brighter the image will seem.
But there are drawbacks to having too high a Gain surface, with a distinct loss of viewing cone being the most prodominant. Get far at all "off axis" to the screen and brightness can drop noticeably. Or precipitously if the gain is over 1.5 - 2.0.
Spandex is a material that reflects light very well, but because it is also very thin, when washed with light, some light does penetrate, so there is a loss of gain. That is why Spandex is usually backed by another layer of the same or lighter / darker material to prevent undue loss of light. If someone is using Spandex for it's acoustical transparency attributes, then the second layer must be Spandex. If it's simply for use as Screen, a White / Gray / Silver hard,opaque surface is a very good solution.
Of all the Spandex materials, the type called "Milliskin" has the finest weave. I just finished construction a 135" diagonal 2.35:1 example and I gotta relate that the finish (weave) of the spandex leaves nothing to be desired against the finest sprayed on coatings I can achieve. And I ain't no slouch at spraying either.
In your case, I would suggest the following for the Screen if you can stretch it out / over a White surface. http://spandexworld.com/c3/catalog/product/5954
That Sir is about all there is at this point.
For additional info please remit a Krugerrand to..........................................