Originally Posted by Schurter
So I am finely getting to the point I can build my screen.
I have Carl's flex white.
Going to make a 140-144 / 2.35-2.39 screen for my space.
Projector 950r jvc
15ft distance from the screen.
You Need To Be A Minimum Of 15'-6" "Lens To Screen".........No Less.
Sitting about the same
My goal was 1.3g with BF
But that extra bump to 1.5 helps FL
So at what point is to much
That is a question that requires several answers.
I would venture to say that 1.3 Gain with the 950r is more than enough to see an exceptionally vibrant image, since at 15'-6" and that gain point you'd get 33 fl
Once you go past 1.3 gain, a noticeably Reduced Viewing Cone (both H&V) proportionate to the increase is one major drawback...albeit one that every owner of any higher Gain screen must accept. You must also adapt the Projector's mounted Lens height to be just above the Screen's image height....something that is harder to accommodate with a shorter height 2.39:1 screen
Perhaps for me though, the most troublesome aspect is the increased potential to see the granularity of the increased amount of Mica content in lighter areas of content (Sky - Flesh Tone close-ups - very light Pastels ) Much however depends on viewing distance and visual acuity.
The gain can be increased by adding 50% more White Pearl and 20% more White Base per mix volume. Adding more Silver Metallic will produce the biggest gain in "gain", but it is those darker areas between the Mica Flakes that creates the disparity in appearance, bringing out the "darker" areas to view. Many think it is because of the reflectivity of Mica itself, but in truth it is a darker Grey Base of the SM that is the reason. You notice the areas that are substantially darker than the Mica more readily. That is a overriding reason that the Lighter BF mixes that contain less Silver and more White & Pearl are the ones with the highest Gain.
Lastly, increased Mica Content (Silver or Pearl) can increase the appearance of "Spark'lies", although that effect can be adjustable by altering the PJ's height and thereby altering the angle of reflective incident. However.....even though the very nature of spraying the paint on in multiple coats so as to achieve a widely dispersed and varied arrayed angle between the Mica Flakes and the incoming light is an essential reason for spraying, with higher Mica content comes more likelihood of seeing a "sparkle....simply because there is a higher concentration of such.