Fixing green on a Barco 1209ish - AVS Forum
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post #1 of 16 Old 03-07-2012, 05:09 AM - Thread Starter
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Now that I've finally got round to getting HCFR working with a decent meter I confirmed the measurements that I'd always assumed were way out and due to meter drift on my projector are probably right and my green is quite a way off, my reds are a bit orange too but that's correctable with my lut software. The green is simply too far out and while the lut does a decent job with the mid tones it struggles at high saturations.

My projector is a bit of an odd monster, it's a 1208 chassis with 9" tubes build by Roland in the UK and at the moment I've got 3 HD-300 lenses.

As I understand it there are 2 ways of getting a better green, tinted lenses and tinted c-element (or both presumably). Of these the c-element look like a bit more work than I'd like to tackle but a lens replacement seems like a good idea and while not simple at least doesn't involve taking the beast off the ceiling.

If by some miracle this is roughly correct what should I be trying to buy and from whom. If I've misunderstood all this please point me in the correct direction.

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post #2 of 16 Old 03-07-2012, 08:29 AM
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Quote:
Originally Posted by JohnAd View Post

As I understand it there are 2 ways of getting a better green, tinted lenses and tinted c-element (or both presumably).
John

no, you never do both and in this case it's not even an option. The HD10 series lenses are all clear (glass not plastic). The tube can be pulled for a C element replacement without dropping the entire machine off the ceiling.

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post #3 of 16 Old 03-07-2012, 09:27 AM - Thread Starter
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Quote:
Originally Posted by draganm View Post

no, you never do both and in this case it's not even an option. The HD10 series lenses are all clear (glass not plastic). The tube can be pulled for a C element replacement without dropping the entire machine off the ceiling.

Thanks, just for me to be clear are you saying there's no such thing as tinted lenses or just that both is never done?

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post #4 of 16 Old 03-07-2012, 10:02 AM
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Before I installed a set of color corrected HD144 lenses on my BG808S I used a red gel filter taped over the CRT face. I did lose a little sharpness but achieved much better reds. The 808 is an AC unit but you may be able to rig up something similar on an LC pj. The gel filter was about $10 a sheet which I cut to size. A theatrical lighting store will have a variety of different shades to choose from, so buy a couple and see which look best. Take a look at the shade of green used in the Cine 9 to get a ball park idea.
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post #5 of 16 Old 03-07-2012, 11:03 AM - Thread Starter
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Originally Posted by lewis View Post

Before I installed a set of color corrected HD144 lenses on my BG808S I used a red gel filter taped over the CRT face.

So is there an equivalent lens that would fit my pj? Or have I misunderstood something fundamental.

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post #6 of 16 Old 03-07-2012, 11:38 AM
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Originally Posted by JohnAd View Post

So is there an equivalent lens that would fit my pj?

No, you need green c-element for HD-10 series.

Filtered lenses are only for air coubled tubes.
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post #7 of 16 Old 03-07-2012, 11:55 AM - Thread Starter
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Quote:
Originally Posted by Ile View Post

No, you need green c-element for HD-10 series.

Filtered lenses are only for air coubled tubes.

Ahhh the penny drops, thanks for that, I think that's the bit that I was missing.

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post #8 of 16 Old 03-07-2012, 12:02 PM
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I was just offering up an alternative to replacing the C-element which as you probably already know will be a bit of an ordeal. They may also be hard to find.
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post #9 of 16 Old 03-07-2012, 12:07 PM - Thread Starter
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Originally Posted by lewis View Post

I was just offering up an alternative to replacing the C-element which as you probably already know will be a bit of an ordeal. They may also be hard to find.

Understood and thanks for the additional option, I am considering that too but am worried about losing any sharpness and I notice you moved on.

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post #10 of 16 Old 03-07-2012, 12:17 PM
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Originally Posted by JohnAd View Post

Understood and thanks for the additional option, I am considering that too but am worried about losing any sharpness and I notice you moved on.

John

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post #11 of 16 Old 03-07-2012, 09:23 PM
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I could have sworn I replied to this thread. Oh well you got your answer.

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post #12 of 16 Old 03-08-2012, 10:29 AM - Thread Starter
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Quote:
Originally Posted by draganm View Post

The tube can be pulled for a C element replacement without dropping the entire machine off the ceiling.

OK I think I'm going to have to try this, so what do I need: glycol and a new c-element? what are the part numbers I'm going to need? Is it relevant precisely what tubes I have?

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post #13 of 16 Old 03-09-2012, 07:06 AM
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John,
Have you been to Curt Palme's forum?

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post #14 of 16 Old 03-09-2012, 08:31 AM
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Quote:
Originally Posted by JohnAd View Post

OK I think I'm going to have to try this, so what do I need: glycol and a new c-element? John

yes, that's it. I don't know the part numbers but there are only 1 type of C-element for the HD10series lenses, made by 3M but out of production.
Just be aware that there are 2 different green's, the wrong one used in the G90 and right one found in all the barcos and marquee's. I might have an extra marquee Green, PM me as a reminder and I'll look.

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post #15 of 16 Old 03-09-2012, 02:37 PM
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Yeah and for Barcos it really mostly the Runco clones and Cine9 the rest of the Barcos were not normally color filtered.
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post #16 of 16 Old 03-09-2012, 03:08 PM
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Quote:
Originally Posted by draganm View Post

the wrong one used in the G90

Depends on your POV. From a light output perspective it was the right choice, which is why Sony choose it. From a critical HT stance, completely the wrong choice, but still better than no color correction at all.
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