CurtPalme.com Home Theater Forum

[Nashou66]

it help if you could also find the right mask for the back of the Lens. But there is an AR coating that would come off if you used an adhesive.

Athanasios

[stridsvognen]

ill not do more than this.. I'm sure it reduces a lot of light output to the room, and remove the cross light between tubes, and some reflections bunching around between the tube and lenses.

ill let you know later if its worth the time..

[stridsvognen]

Now i have seen a bit, and im happy.
Ill say its a big improvement in Ansi contrast, i just had to check the gamma, its calibrated to 2,24, and i i thought it was way higher today, but no.. 2.23, White balance looks almost the same, but light output at 100% has dropped 0,6fl with the masking.

And its clearly changed from a bit washed out Picture into something that in some scenes looks stunning,

Halo is still the same, its still not a LC machine, but its well worth the time controling all the light bleed between tubes, and reflections.

I actually think ill do something like this to the tubes on my 9500LC when im going to change belows and paint the chambers.

[Spanky Ham]

Strid,
Interesting test. I know NEC put black tape on the bottom and top of the c-elements in their LC pjs. I have always thought that if one could paint the tube face and both sides of the c-element then you could increase ANSI in a LC pj. Scott either thought I was nuts or didn't think it would work, but it was probably the former. I guess the only issue for my idea would be what kind of black paint/coating would hold up to glycol and stick to the surfaces long term.

[stridsvognen]

for LC ill use the same Black epoxy pant for the masking as ill use for the Marquee alu chamber, It would not be fun to make the masking to big..

I wonder why this is not more common for AC projectors, its fast, cheep, and a huge improvement, at least on a Marquee.

[stridsvognen]

here is the Measurements from before and after masking, later ill get the White balance perfected, and the gamma a bit Down in the low end, and up in the high end.

[fragzero]

Seems this is something i have to try

HD144/HD145 are said to improve contrast and reduce the Halo effect, maybe these have some kind of coating which reduces the reflections? (you are using hd8's right?)

[CasetheCorvetteman]

XG LCs have a black piece stuck to the C-element top and bottom on the sets ive seen, simular to what you designed.

EDIT: Spanky allready said that, i was still on previous page....

[stridsvognen]

[stridsvognen]

If anyone like to see the gamma run..

[stridsvognen]

[CasetheCorvetteman]

Provided the paint doesnt desolve in the glycol!!

[stridsvognen]

[CasetheCorvetteman]

Be damned if im pulling my tubes out!! It is astigged , focused and converged perfectly at the moment

[gjaky]

[stridsvognen]

Im sure the HD145 is better all around, and one of the things i miss with this 8500AC i have here, is the color corection, and better corner focus would be a +.

But like its just a test machine, and i have 2x 9500LC im not going to spend much Money for lenses on this 8500.

I have the feeling that its possible to make a super nice 8" AC machine cheep, that was my goal, just see what i could do for no money, and a bit of time.

[gjaky]

[stridsvognen]

[gjaky]

Well I owned a Marquee 7500 (though not an ultra, but was fully modded) along with the NEC, guess which one went. But I understand that there is not enough NEC for everyone, so some people must settle with another brand, it's sad, but true.

[stridsvognen]