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stridsvognen
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| Posted: Tue Sep 17, 2013 6:55 am Post subject: Displaying true a window ? And side stacking.? |
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Im planing on Building a hush box for my comming CRT setup, and was wondering if its possible to Mount a window in front of the lenses without any negative effect to the image.?
The idea was to keep the dust out and the sound in.
I have a dream to hang 2 Marquee 9500LC Ultra in a side by side stack, making it posible to run them as a stack or as normal single projectors.
Im not sure how much trouble it will give me moving the projecter off center to the screen.
Most of the idea in the side stack is always to have a working calibrated projector.
Another solution is to Mount 2 projectors on a slide, so they can be pushed into position, and the 2nd projector is ready to be pushed in its place if needet.
I love this hobby, but know that having just 1 projector setup Means that it will mostly be messed up by the owner that constantly wants to test another board, or calibrated it to another sourse and so on...
This time i want a stable calibrated projector that is always working, or ready to show a movie whenever the Family desires.
And another that can please my curiosity. 
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fragzero
Joined: 30 Aug 2012
Posts: 344
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| Posted: Tue Sep 17, 2013 7:30 am Post subject: |
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Maybe you can have 2 different lenses on the projectors and mount them with a small difference in height? Or keep the 8500LC as backup/always working set? It probably has quite a big throw?
I think there is special projectionglass, people have been doing it so that part of your project should not be a problem!
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stridsvognen
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| Posted: Tue Sep 17, 2013 9:24 am Post subject: |
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| fragzero wrote: | Maybe you can have 2 different lenses on the projectors and mount them with a small difference in height? Or keep the 8500LC as backup/always working set? It probably has quite a big throw?
I think there is special projectionglass, people have been doing it so that part of your project should not be a problem! |
My Marquee have quite close trow. HD10E and GT17, and the HD8 also seems to be quite close, i think its maybe max 5cm difference.
The main idea is to test and mod one 9500LC and transfer it to the best one when sure i have found better solutions.
So one will be a kind of test machine, and with the option to do a A-B comparison.
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fragzero
Joined: 30 Aug 2012
Posts: 344
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| Posted: Tue Sep 17, 2013 9:26 am Post subject: |
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Ah right you have a 8500 AC, a 8500Lc has a really long throw due to the 9" lenses and the relative small Raster.
What about stacking the projectors? Or is that not very practical in your room? (24/24 near the ceiling, test setup a little lower)
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stridsvognen
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| Posted: Tue Sep 17, 2013 9:44 am Post subject: |
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| fragzero wrote: | Ah right you have a 8500 AC, a 8500Lc has a really long throw due to the 9" lenses and the relative small Raster.
What about stacking the projectors? Or is that not very practical in your room? (24/24 near the ceiling, test setup a little lower) |
I want to be able to walk under my CRT, and dont like the idea of the other one on top with massive keystone..
Prefer to stay inside the max 15 degree angle on the screen up Down.
Its also importent that i have easy acess to the inside of both machines to change boards tubes and so on.
But need to find out how a ofsett angle sideways effects the image, so i know if i can make a permanent Mount on, or need a slide solution.
I have 2x 9500LC, the 2004 9553LC Ultra with HD10E, and my 1997 Vidikron Vision One with GT17 , that i plan to transform into a Ultra.'
The 8500 Ac will find another purpose, or donate parts.. 
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fragzero
Joined: 30 Aug 2012
Posts: 344
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| Posted: Tue Sep 17, 2013 10:02 am Post subject: |
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A setup with mirrors maybe?
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Tue Sep 17, 2013 10:06 am Post subject: |
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Going through un-treated glass will have an effect on the image.
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fragzero
Joined: 30 Aug 2012
Posts: 344
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stridsvognen
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| Posted: Tue Sep 17, 2013 10:32 am Post subject: |
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| fragzero wrote: | | A setup with mirrors maybe? |
No way.. lol Its complex enough already..
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stridsvognen
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| Posted: Tue Sep 17, 2013 10:35 am Post subject: |
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Thanks for the link..
i know glass have a mirror effect, and its potential a problem.. Another solution is a foam like the one used betwen the marquee lenses, just thicker, to keep the sound in the box, maybe let it Work as a air intake for the ventilation.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Tue Sep 17, 2013 2:14 pm Post subject: |
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Foam front is the best idea. Also remove the plastic covers if doing a side stack so the PJ's are closer together eliminating top and bottom keystone. Also I think it might benefit if the green tubs are put in the center so the inner positions where the red and blue are then red where the greens are and blues on the other edges.
Nashou
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Tue Sep 17, 2013 2:23 pm Post subject: |
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"Optical glass" or optics grade glass is what you need to project through. It will have almost no impact on the image.
We do this with DPI projectors all the time and sometimes with CRT.
craigr
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stridsvognen
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| Posted: Tue Sep 17, 2013 2:26 pm Post subject: |
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| Nashou66 wrote: | Foam front is the best idea. Also remove the plastic covers if doing a side stack so the PJ's are closer together eliminating top and bottom keystone. Also I think it might benefit if the green tubs are put in the center so the inner positions where the red and blue are then red where the greens are and blues on the other edges.
Nashou |
Been thinking about that,.. I think thats the way to go, to keep Green most centered.
the plan was to try and pust the projector i have on the floor now.. And see what the top botom keystone do to the image..
wondering if the scanlines will overlap more or less.. I have visible scanlines now looking into the lenses running 1080P 72hz
The plastic will fly off all around.. And if it looks to degrade my image im going to make a slide system where it lock in position, so the projector in use is setup the normal way.
Last edited by stridsvognen on Tue Sep 17, 2013 2:31 pm; edited 1 time in total
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stridsvognen
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| Posted: Tue Sep 17, 2013 2:30 pm Post subject: |
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| CIR Engineering wrote: | "Optical glass" or optics grade glass is what you need to project through. It will have almost no impact on the image.
We do this with DPI projectors all the time and sometimes with CRT.
craigr |
Thanks for the input..
It would help keeping the lenses clean.. Hate cleaning those.. they are so easy to scratch..
If the glass can be found cheep, or at least not to expensive i can always give it a try..
For sure ill keep all options open when i build the box..
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RogerH
Joined: 14 Jul 2010
Posts: 64
Location: Minneapolis
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| Posted: Tue Sep 17, 2013 4:17 pm Post subject: |
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I don't post here much but I wanted to weigh in on the use of glass in front of your lenses since I have experimented with this a bit and would recommend it.
I used double coated 1/4" optical glass on the front of my XG hushbox with minimal adverse effects. At the time (about 4 years ago) the glass cost around $45 plus shipping. The benefits with noise reduction outweigh any minor image degradation, in my opinion.
What I would do if starting over would be to buy a piece large enough in the vertical direction to allow experimental rotation in the horizontal axis to find the position you like best. You may want to compare the screen image (with high contrast text, for example) with the glass perfectly parallel to the tube, and then with the glass significantly off angle from the tube faces. I found that angles only slightly off from perfectly parallel from the tube will give multiple reflections between the glass and the tube resulting in ghosting (the infinity mirror effect). I ended up setting mine parallel, but all indications were that an angle might work as well or better, but I ran out of glass in the vertical dimension. You might think that having the glass at an angle would be bad, but it is amazing how little effect it has for small angles with good glass.
The optical glass has a high percentage transmission characteristic and appears colorless on edge, not green. The IR remote also works through it.
I recirculate filtered air from a basement blower (pressure blower-very noisy) into my theater hushbox, and I honestly have to rely on the blower LED to tell be the air is running-it is that quiet with the glass.
Roger
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Wed Sep 18, 2013 5:57 am Post subject: |
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Hey strid if you remove the vision one case let me know I want it
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stridsvognen
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| Posted: Wed Sep 18, 2013 6:11 am Post subject: |
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| the big E wrote: | | Hey strid if you remove the vision one case let me know I want it |
I think ill use that one for the 8500 if it will hang in another room.
And if not, i think it will be damn expencive to ship it over the Water.. 
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Wed Sep 18, 2013 6:20 am Post subject: |
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| stridsvognen wrote: | | the big E wrote: | | Hey strid if you remove the vision one case let me know I want it |
I think ill use that one for the 8500 if it will hang in another room.
And if not, i think it will be damn expencive to ship it over the Water.. |
Ouch anyway if its not pricy to ship I would take it for sure if that is you don't use it
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