CurtPalme.com Home Theater Forum

Alaric · Posted: Fri Jan 05, 2007 10:15 pm Post subject:

Hi Guys,

Galen - The adaptors you've made use the HD8 base, which is not just a flat plate of glass, its curved and as such is part of the lens package...As such are these HD145/HD144's or actualy a Hybrid and as such what does that do for the projection optics

I'm certainly not an optics man, As such, why do the HD144/145's need to be closer than the HD8's and as such what happens with the hybrid above, as this is not closer ???

Ta,
Lee

Ile · Posted: Fri Jan 05, 2007 10:19 pm Post subject:

Joust · Posted: Fri Jan 05, 2007 10:25 pm Post subject:

Spotmatic · Posted: Fri Jan 05, 2007 11:28 pm Post subject:

Whatever the outcome: please add me on the list, please... If the price is between $150 - $200 then I'm in Very Happy

Tom.W · Joined: 09 Mar 2006 Posts: 6635

If there is someone in the US with auto cad and feels up to the task I have a set of Bjorn's adapters here I can loan out for measurements . Very Happy

Joust · Posted: Sat Jan 06, 2007 12:16 am Post subject:

Alaric · Posted: Sat Jan 06, 2007 12:32 am Post subject:

Hi There,

I could certainly knock up some autocad or router files from the image that Spot posted+a few dims....I could machine it too on a semi-personal side, but to be honest, i don't like the loss of lens flapping...As Galen has mentioned, almost every PJ has some form of this correction (if not infinte as graphics, washers as data) and to loose it completly would be a step backwards in my mind, albeit at the gain or colour balence and some focus benifits.

Copying Bjorns adaptors is certainly more than posible, but while an option, i still feel its a compromised solution.....Although the more i study the mounts the more i can see why he chose that solution.

Ile - Looking at the barco cast plate, any cut out is going to be difficult, the location/rotation isnt going to make it easy, posible maybe, easy no. The more i look at those plates, the more i'd look at modding the lens (or plastic houseing to be precise) to some degree.

cya,
Lee

zGman · Joined: 22 May 2006 Posts: 599

Hi Alaric,

There is no hybrid as far as the lens is concerned, just the mounting.
As for why the focus point is different from the HD8, that's completely
inherent to the HD 144/145 optical design - that's just the way it is.

The interest in this is just great, and the CAD drawings are superb(!),
but until one of you actually takes apart a BarcoGraphics lens/tube
mount to find out how it is designed..................!?!

The suspense is just killing me........hohoho!

Cheers,
G

Moose · Joined: 09 Mar 2006 Posts: 788 Location: Minnesota

GREG1292 · Joined: 10 Oct 2006 Posts: 417 Location: indiana

I agree Moose there is always hope but I am not taking any chances and going with the best solution out there. Galen is not getting any younger Razz

and we should be thankful he is still willing to make some of his adaptors.

picree · Joined: 31 Mar 2006 Posts: 351 Location: Johnson City, TN

zGman · Joined: 22 May 2006 Posts: 599

Hi Greg ol' buddy,

Thanks for telling my secret on the worldwide forum!
Not getting any younger, eh? man, that was tough to read about....

hohoho!
G

zGman · Joined: 22 May 2006 Posts: 599

Hi picree,
How about that nice front retaining ring?
Its not too hard to remove if you compress the springs a bit, try CCW.....
There is some serious thin section die casting and tricky machining.
Also if you will notice they addressed the issue of light leakage and
"cross-talk" (between housings), which the Marquee AC design
pretty well ignores.
Cheers,
G

Tom.W · Joined: 09 Mar 2006 Posts: 6635

What are Barco castings made of ? Looks like a Magnesium alloy on the rear CRT plate . Their very thin but very strong .

zGman · Joined: 22 May 2006 Posts: 599

Hi Tom,
Another late night can't get to sleep.....again!
Anyhow, yes its a mag alloy for the whole assembly,
probably a fair amount of aluminum in the mix, maybe some zinc also.
The tilt adjust screws are stainless however - non-magnetic.

Its a nice design when you study it a bit, the light path is shielded
out to the lens and the vert/horz tilt is symmetrical about the central
axis with the retaining ring set-up. It is also lightweight and uses a
minimum of parts. The weight could be important it you were 'flying'
nine of these around in a simulator, and the extra cost of the precision
castings could be amortised over a large qty of units produced versus
materials saved and rough machining time saved

Happy weekends for all!
G

picree · Joined: 31 Mar 2006 Posts: 351 Location: Johnson City, TN

GREG1292 · Joined: 10 Oct 2006 Posts: 417 Location: indiana

When are we going to have a lens adaptor shootout? I think the work everyone is putting in is outstanding and moving crt into the 30th century where Galen will be still making his adaptors.

Tom.W · Joined: 09 Mar 2006 Posts: 6635

Quote:

" Cross-talk-yes the "inter-tube" is nice. That would be omitted with Bjorn's or the Marquee plates "

Actually with Bjorn's design the CRT mounts directly to the rear of adapter plate hence no light spill .

Joust · Posted: Sat Jan 06, 2007 3:58 pm Post subject:

Yes, I think that "inner Tube" would have to go away. at least partially anyway. We will see.
We could easily replace this functionality with some weatherstripping. There are 100's of shapes and sizes. I was thinking of adding this to the Marquee. I've read that others use painted peices of cardboard between tubes etc.

Alaric · Posted: Sat Jan 06, 2007 4:32 pm Post subject:

Hi There,

Also arround the back of the mounts and at the sides, mine has some form of foam inserts which means there is no light anywhere but down the lenses.

Galen - How can you say the lense adaptors and rear of the HD8 is not a hybrid if it uses the rear of the HD8, unless you remove the glass portion of the rear part....and then the Hd144/145 would be too far forward ?

Cya,
Lee