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  Topic Review (Newest First)
01-23-17 05:35 AM
Sebastian Piest
Re: Help with the Black Widow PFG DIY Projection Screen

Hi. I wanted to try out to paint my screen with AutoAir 4101 and a grey tone.
I tested it with RAL 7038 and the white seems to drift to a yellow or green touch - it's not natural anymore.

This is RAL 7038:
https://www.ralfarbpalette.de/ral-7038-achatgrau

Would RAL 9006 make a better difference, since it's more grey?
https://www.ralfarbpalette.de/ral-9006-weissaluminium

Or 7047?
https://www.ralfarbpalette.de/ral-7047-telegrau-4

I mixed 400ml color with 100ml AutoAir 4101.
10-28-15 07:53 PM
andrew91386
Re: Help with the Black Widow PFG DIY Projection Screen

Quote:
mechman wrote: View Post
Unfortunately there is no way to fix it.
I figured that might be the case. It's ok though, my wife apparently likes the color and wants to use it for the guest bedroom. At least it won't go to waste! Thanks for your help, I'm doing a little bit more research on this site this time!
10-27-15 07:22 PM
andrew91386
Re: Help with the Black Widow PFG DIY Projection Screen

I'm not sure if this is the right thread, but I happened to find it while looking for why my paint color turned out wrong. I was trying to make the BW paint according to this thread: http://www.hometheatershack.com/foru...ack-widow.html
But after reading through everything, it seems I added the new AAA to Bermuda Beige, and so basically just got a slightly darker beige after adding. I see that you've recommended a different paint for the new stuff, but is there a way to salvage the paint I already have? I'd rather not have to buy everything again, but I understand if it's not fixable. Thanks!
06-04-13 09:28 PM
Harpmaker
Re: Help with the Black Widow PFG DIY Projection Screen

Quote:
mechman wrote: View Post
Given what I know so far of the new AAA, either G or H.
The member PM'ed this question to me and I said to use J, but the more I think about it I believe H might be more appropriate after all. I now forget at what point adding AAA-F to a base paint makes the mix lighter rather than darker.
06-03-13 06:55 PM
Yiannis1970
Re: Help with the Black Widow PFG DIY Projection Screen

Quote:
mechman wrote: View Post
Given what I know so far of the new AAA, either G or H.
06-03-13 01:14 PM
creeker79
Re: Help with the Black Widow PFG DIY Projection Screen

What shade of grey from this would you recommend with newer auto aluminum base thx!
05-27-13 03:38 PM
Harpmaker
Re: Help with the Black Widow PFG DIY Projection Screen

Quote:
ange wrote: View Post
Hello,
my setup is not based on polarization. It's dolby 3D filters
(I cant post a link but you can go on avs forum search "infitec" key word)
It's color filtering based on dichroic filter and this method works fine without any special screen.
In my case I need only a gray screen with gain (best reflection possible without hot spot) and a paint that I could be rolled. Do you have any advice if black widow is not appropriate?

Thx
OK, since you aren't using a polarized 3D solution then the only thing you must be concerned about is how much light is lost by the infitec system. With most active 3D and polarization systems this amounts to at least a 50% reduction of image brightness and can approach 75%. It looks like the infitec system could retain more image brightness that the other systems, but I found no hard data on this with my search.

Black Widow™ has a measured gain of 0.89 so you are losing only about 10% of image brightness compared to a 1.0 gain screen. I'm not sure what the gain of your screen would be with your custom mix, but if it was greater than about gain 1.2 you would probably see some hot spotting.

Adequate screen brightness is a very subjective thing so ultimately the only real way to find out if a screen mix will work for you is to try it.

That brings us to the current state of Black Widow™; we recently discovered that the manufacturer of the aluminum paint used to make BW™ changed their formulation and that has in turn changed the color of the base paint used to make BW™. We are doing tests to find new base colors, but early testing suggests that almost any neutral gray paint can be used, We suspect this will eventually lead to a series of new BW™ mixes in varying shades of gray from very light to very dark.

People making BW™ from now on must know the batch number of the Auto Air Aluminum-fine they use to make the mix since this will determine what base color to use. The older version of AAA-F must use a base that is a pinkish-beige for it to result in a neutral gray mix. The newer version of AAA-F does not have that limitation.
05-27-13 04:26 AM
ange
Re: Help with the Black Widow PFG DIY Projection Screen

Quote:
Harpmaker wrote: View Post
If I'm running the numbers right you are getting an image brightness of about 8fL on a 171" diagonal screen. This is too dim to use Black Widow™. However, I see you are using two projectors so this should double that brightness to 16fL which is good and a BW™ screen would work! The problem is that you lose so much brightness in the 3D process that you are back to being too dim again. Also, screen paints that use aluminum or mica flakes work poorly with passive 3D since they don't preserve light polarization that is required by that process. When enough aluminum is present in the mix to retain good polarization hot spotting occurs.
Hello,
my setup is not based on polarization. It's dolby 3D filters
(I cant post a link but you can go on avs forum search "infitec" key word)
It's color filtering based on dichroic filter and this method works fine without any special screen.
In my case I need only a gray screen with gain (best reflection possible without hot spot) and a paint that I could be rolled. Do you have any advice if black widow is not appropriate?

Thx
05-25-13 09:08 PM
Harpmaker
Re: Help with the Black Widow PFG DIY Projection Screen

Quote:
olwe wrote: View Post
Hope you're feeling better, Harp!

Having read what you wrote about a neutral grey paint with the old AAA-F, what if I add ½quart of BB with old AAA-F, and ½quart of neutral grey (lighter shade) with the new AAA-F, will the result "still" be a BW mix?

The reason I'm asking is because I don't want to waste the stuff I got before. I already have a quart of flat BB paint from Behr, old and new AAA-F. I still have to buy the lighter neutral grey paint. I'm thinking of Valspar in eggshell for added screen gain. Does mixing different brands of paint together spell trouble?

Should I go ahead with this or does this sound out of whack and just scrap the idea.
I agree with Mech that this should work fine, but not having done it and measured it I can't be 100% sure. The theory is sound.

I haven't tried using Valspar eggshell to make BW™, but I suspect it will work fine. If there would be any hot spotting in would be mild.

You are relatively safe mixing two brands of interior latex paints together to use as a screen mix. Where things start to go bad is when vastly dissimilar paints or finishes are mixed together (like latex and polyurethane).

Thanks again for the well-wishes. This bug is proving hard to get rid of.
05-25-13 08:56 PM
Harpmaker
Re: Help with the Black Widow PFG DIY Projection Screen

Quote:
ange wrote: View Post
I've mixed white pearl titanium white, a matt medium and water with the silver which is 22% of the mix

the screen is 3,8m by 2,1m


depending on where I sit I could be between 4m to 6m from the screen





Thx for your answer
If I'm running the numbers right you are getting an image brightness of about 8fL on a 171" diagonal screen. This is too dim to use Black Widow™. However, I see you are using two projectors so this should double that brightness to 16fL which is good and a BW™ screen would work! The problem is that you lose so much brightness in the 3D process that you are back to being too dim again. Also, screen paints that use aluminum or mica flakes work poorly with passive 3D since they don't preserve light polarization that is required by that process. When enough aluminum is present in the mix to retain good polarization hot spotting occurs.
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