Reflecterol screen paint vs dream screen sample vs Grey steel 2

3rdignis

Active Member
That looks great :)

When I covered the last bits (white door and radiator) made a difference.

What ftL are you reading at screen?
What is your screen gain?

I would aim for 14-16ftL
 

Doctor Smith

Well-known Member
u have a killer room doc!! def stretch the cash and get the paint mate IMO. massive improvement, u can clamp down iris maximise contrast
I'm not sure what get GS2, 3 or 4? I have an Epson tw9400 btw
 

kenshingintoki

Distinguished Member
I'm not sure what get GS2, 3 or 4? I have an Epson tw9400 btw
Depends on what you want and what screen size you are at, if you want more brightness the reflecterol is what I’d get. If you can’t afford it gs4
 

3rdignis

Active Member
Does your screen reflect 14-16ftL?
 

3rdignis

Active Member
In a light controlled room, 14ftL may take couple of weeks to get used to.

What it does is give you maximum perceived contrast and less eye strain.
 

Doctor Smith

Well-known Member
Projector is 12 ft from screen. Doesn't really reflect. Screen size 97 inch diagonal 2.39.1. I want better black level but don't want to compromise whites too much.
 

3rdignis

Active Member
In a light controlled room choosing screen gain is easy.

Aim for a reflected 14-16ftL with closed iris.

i.e set screen size, close iris, choose correct settings.

Measure ftL at screen, use med or low lamp to get close to 14-16ftL measured at screen

If you measure 14-16ftL get 1.0 gain screen

If you measure 28-32ftL get 0.5 gain screen

If you measure 10 ftL get 1.5 gain screen

Although you might run into problems with a screen greater than 1.3 gain


If a screen is 1.0 gain it will be even light level across

Low or high gain screens lose 20-25% at an angle of 20° so 16ftL at centre of screen can become 12ftL at edges.

On my 9300 I used an nd2 filter to cut light by half.
 

3rdignis

Active Member
If your screen gain is 1.0 I think your image may be too bright.
If you want, I'll post you my nd2 filter to try.
 

3rdignis

Active Member
Have you got one of these yet?

 

kenshingintoki

Distinguished Member
Few more tests . Made my Decision to go with reflecterol. It’s something special imo.
 

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Doctor Smith

Well-known Member
If your screen gain is 1.0 I think your image may be too bright.
If you want, I'll post you my nd2 filter to try.
That's so kind of you to offer. Unfortunately I used an nd2 filter before and didn't like it. Though it made picture too dull.
 

Doctor Smith

Well-known Member
I'm going to get some testers grey stell 2 is now called Dulux chic shadow
Gs3 is polished pebble.
 

Doctor Smith

Well-known Member
What the best paint roller to use?
 

Conrad

Moderator
If your room is light controlled get GS4 (Indian white), it's the only commercial paint which has a completely neutral balance across RGB. This means you don't have to calibrate down any of the other colours and therefore give up brightness.


I'm sending Ken a sample of my GS4 so that we can see how it compares to the reflecterol. What he's told me so far I think the reflecterol will win as it's brighter and also completely flat, so you don't need to reduce any colour's output.

Most whites aren't white, they're blue shifted, so once calibrated you're back to GS4 anyway.
 

Doctor Smith

Well-known Member
Thanks so much. What roller would you recommend?
 

kenshingintoki

Distinguished Member
If your room is light controlled get GS4 (Indian white), it's the only commercial paint which has a completely neutral balance across RGB. This means you don't have to calibrate down any of the other colours and therefore give up brightness.


I'm sending Ken a sample of my GS4 so that we can see how it compares to the reflecterol. What he's told me so far I think the reflecterol will win as it's brighter and also completely flat, so you don't need to reduce any colour's output.

Most whites aren't white, they're blue shifted, so once calibrated you're back to GS4 anyway.


Conrad, for Doc's screen, don't you think he'd be better off with GS2? It looks like he has a small-ish screen with a bright projector so surely he needs to cut the light? He understandably doesn't like ND filters so GS2 looks like a way to cut out 40% of life, lower black floor and give a better preceived contrast ?
 

Conrad

Moderator
I got the best one they had in homebase!
You want a medium nap high quality is the only instruction I had.

For my wall we did a quick few coats to test, but then we got decorators in. They did an amazing job painting, sanding and recoating the wall. It's incredibly smooth now and has no roller marks.

I was lucky and I got a couple of guys that really understood what I was trying to achieve and took their time over it.

My wife and I rushed it and got three coats on in a day with no sanding. To be honest it looked ok, a few roller marks here and there but nothing you could see with content.

If I was doing it I would fill and sand the wall first, then coat, then sand, then coat again. All with at least 4-6-8 hours drying time in between. It's not something that responds well to rushing.
 

Conrad

Moderator
Conrad, for Doc's screen, don't you think he'd be better off with GS2? It looks like he has a small-ish screen with a bright projector so surely he needs to cut the light? He understandably doesn't like ND filters so GS2 looks like a way to cut out 40% of life, lower black floor and give a better preceived contrast ?
I assume that, with the lights out, the room is a complete bat cave.
In which case, why sacrifice light output? Wouldn't you just close the iris?

We could split the difference and go for 3?

I'd buy a tester of each and paint stripes :)
 

kenshingintoki

Distinguished Member
I assume that, with the lights out, the room is a complete bat cave.
In which case, why sacrifice light output? Wouldn't you just close the iris?

We could split the difference and go for 3?

I'd buy a tester of each and paint stripes :)


can epson 5000 close iris that much?
not really sure

maybe my maths is wrong but i thought 90 inch screen epson 5000 might need negative gain to reach SDR level calibration 14-16fl even with close iris ?
 

Conrad

Moderator
can epson 5000 close iris that much?
not really sure

maybe my maths is wrong but i thought 90 inch screen epson 5000 might need negative gain to reach SDR level calibration 14-16fl even with close iris ?
Yeah, maybe, I don't know that model so I can't comment.

Good points to check, thanks for picking it up.

@Doctor Smith, happy to provide any photos of a GS4 wall you might be interested in.
 

Doctor Smith

Well-known Member
My room is a Batcave.
Room size 12.5 x 12.5 ft
Screen 97 inch diagonal 2.39.1
Projector Epson TW9400
Will be painting an existing white projector screen.

Hope this helps.
 

3rdignis

Active Member
It's very simple, get one of these


If your reading 30ftC at screen, facing projector and say you want 15ftL reflected of screen get a 0.5gain screen

ftL = FC x screen gain


I would recommend 14-16ftL, problem is if you have never seen that for any prolonged period of time you won't know if you like it.

If you like commercial cinemas, that's what their supposed to use when their not trying to save money, further turng brightness down. A good example is imax.

Lowering peak white to 15ftL doesn't give dimmer whites, it gives perceived brighter whites because of improved contrast.

Your eyes have a contrast range say 1,000,000:1 and as the environment gets darker or brighter your pupil closes or opens extending the levels of brightness that can be perceived.

What 14ftL does is keep your pupil relatively closed, but you can still percieve that 1,000,00 contrast brightest whites and darkest blacks

Also your pupil constantly opening and closing can cause eye strain.

If you go much lower than 12ftL then yes the picture will appear dim and you will lose perceived contrast.
 

Conrad

Moderator
That's convenient, I max out at about 58 nits calibrated which is about 17ftL. I might knock the iris down one or two so that I hit 50 for SDR.
 

Doctor Smith

Well-known Member
I've painted my white screen with polished pebble (Grey steel 3) It is darker then the white screen but barely. Everyone that's seen it says its white. I have half a tin of black matt paint. Is it a good idea to mix it to make it greyer? Or will it throw the color off completely.
 

Conrad

Moderator
What paint is it? You can look up the colour balance. If it’s neutral black then you can mix them, anything else will create an imbalance.
 

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