CurtPalme.com Home Theater Forum

snkby · Joined: 12 May 2007 Posts: 130

red/green do anything to reduce haloing?

ive got a set of color-filtered hd-145 that i cant use right now because of throw distance and ive got a set of old sony 187 tubes with colored glycol that i could put into my stock non-color filtered tubes on my marquee8000.

i did at one time briefly put the hd-145 color-filtered lenses on and did notice the deeper colors but didnt pay any attention to the haloing.

so maybe the haloing was reduced and thats why i didnt notice it?

are there any color-filtered lenses for my marquee8000 that have the same throw distance as my hd-8 lenses so i dont have to move the pj?

thanks.

JustGreg · Posted: Fri Jul 04, 2008 4:33 am Post subject:

I get the same thing on my 8500 AC. Nothing we can do about haloing except bite the bullet and convert them to LC. That's why I don't obsess with setup to a certain extent. I go through it all a couple times and call it good enough.

Patterns are an indespensible tool for setup but they can't do anything for the halo around a wall torch in a tunnel scene, or a shot of a bright moon on an inky night sky, so why bother going crazy trying to achieve 'perfection'.

More accurate color I'm all for. I have a set of 145's and Joust Adapters I've YET to mount (after a year). I'm not lazy, (OK, maybe a little) I just dread the thought of taking the thing down and starting from square one again. Shocked

Nashou66 · Posted: Fri Jul 04, 2008 5:05 am Post subject:

snkby · Joined: 12 May 2007 Posts: 130

i agree about the dusting!!

i couldnt believe the amount of dust in the powersupplies!!

ive since added a household floor-vent type filter in front of the intakes.

i never really noticed the haloing until someone mentioned it and now it drives me a little crazy!! Sad

and someone nearby was selling a minty 9500 ultra for $3500 that i didnt have. Sad

soon enough though. Smile

thanks!

perisoft · Joined: 29 Aug 2007 Posts: 2903 Location: Ithaca, NY

Doesn't your EYE pretty much see halos around bright lights anyway? Granted, the limited dynamic range of the PJ means you'll get halos in, say, a closeup of a black keyboard with white characters. But I'm not sure that happens so much...

Or, maybe it's just my glasses that halo. They *are* air-coupled... Very Happy

draganm · Joined: 08 Mar 2006 Posts: 5080 Location: Colorado

Zebu Fellenz · Joined: 21 Dec 2006 Posts: 2548 Location: Phelps, New York

garyfritz · Joined: 08 Apr 2006 Posts: 7097 Location: Fort Collins, CO

Colored glycol won't affect haloing at all. It's still an air-coupled projector, just with more accurate colors.

Nashou66 · Posted: Fri Jul 04, 2008 7:05 pm Post subject:

From what I understand the Halo is the reflection of the light off the outer glass, with a liquid coupled tube there is no second flat glass to reflect the light, the "c" element is that second glass that holds the cooling liquid between it and the face of the tube, the 'c element' is curved reducing/eliminating the halo reflection back to the lens. Not sure if this is exactly how it works but i think its close Very Happy

.

Athanasios

snkby · Joined: 12 May 2007 Posts: 130

the halo itself is a bit of a -distractionary?- nuisance.

what really bothers me is seeing how much light is being spilled into the surrounding image and seeing how much this is affecting the overall contrast in the halo are. Sad

and im going to speculate that the spill-over goes beyond the bright outer ring and is spoiling that contrast too.

im thinking the overall effect of lc is a punchier and more vibrant image with the same video chain.

have the red and green sony tubes on the bench for pulling the colored glycol.

i realized that the volume isnt going to be enough for my tubes but maybe 75% ?

is it worth the time and energy to get to 75% of correct ?

i know i can see the difference from non-filtered to filtered.

would most people be able to see the difference between 75% correct and 99% correct ?

can i do anything to he colored glycol---

i just remembered that i think i have 2sets of sd-187 with colored glycol. Smile

just have to find them but i think i know where they are. Smile

kschmit2 · Posted: Mon Jul 07, 2008 6:38 am Post subject:

do yourself the favor and mount the HD-145 (or HD-144) lenses. They will significantly reduce halos.

The step from HD-8 or HD-6C ML lenses to HD-145 does more to reduce halos than the step from HD-145 to LC.

With HD-145 lenses you should pretty much only get halos with isolated bright objects on an otherwise black screen (e.g. a torch in a dark cave). And even then the halo is much less distracting then the halos you get with HD-8 or HD-6C lenses.

Kai

1031 · Joined: 22 Mar 2006 Posts: 648 Location: Finland

snkby, if you are going to install those hd-145 lenses do this also (This picture is from kaitsu66´s barco808) :
http://www.dvdplaza.fi/galleria/showphoto.php/photo/15845/ppuser/24031
Maskin that unused phospor helps little to get better contrast.

kschmit2 · Posted: Mon Jul 07, 2008 4:39 pm Post subject:

hah, I shall have to try that some day Smile

Ideally the masking material should have a black back btw, but that just a minor thing to consider.

snkby · Joined: 12 May 2007 Posts: 130

kscmit2 : i cant move the pj out into the room anymore or the screen any more forward.

although i think that when i get the screen mounted to a frame the extra 1" and the pj forward it might allow the hd-145 lenses to focus.

right now if i move the pj forward max the hd-145 lenses are right below their limit for being able to focus.

i even considered extending the focusing groove to let the wingnut slide a little more for more adjustment.

1031 : what was used to mask ?

im thinking any kind of tape would probably melt or make a mess.

masking the unused area does seem like a good idea. thanks.

snkby · Joined: 12 May 2007 Posts: 130

draganm : that eyeglass chromatic aberration drives me little crazy too if i let it! lolololol

do you still have the lc stuff available?

1031 · Joined: 22 Mar 2006 Posts: 648 Location: Finland