CurtPalme.com Home Theater Forum

_in_peace_ · Joined: 21 Jul 2009 Posts: 152 Location: Sweden

Picture:

_in_peace_ · Joined: 21 Jul 2009 Posts: 152 Location: Sweden

No 1. expand to cinema scope requires the crt to go further back
No 2. not have to mount it in the ceiling
No 3. Use a real 2.35.1 screen for a nicer feeling
No 4. cinema scope gets really tiny when the crt is in front of you
No 5. gets a really nasty burn in (in long times row)

Mr. Green

To much coffee tonight perhaps or have you seen this before?

Thank's

akajester · Joined: 09 Jul 2008 Posts: 934 Location: Wisconsin

Is it suppose to vaporize the guy in the way? if so you missed the bottom half. Smile

**kal** · Posted: Tue Sep 14, 2010 8:54 pm Post subject:

Regarding installing the CRT projector vertically & using a mirror:

I've seen it done before.

The biggest concern is to use a good mirror and make sure the projector doesn't overheat since they're not really meant to be installed that way. You need to look at how it's cooled very carefully.

The 2.35:1 vs other aspect ratio's has nothing to do with mounting a projector like this and bouncing off a mirror. There's lots of discussion around this here in other threads in the past.

Kal

Spanky Ham · Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central

pjackso did it years ago. I am not sure if he is still doing it.

Ile · Posted: Tue Sep 14, 2010 9:56 pm Post subject:

There is also bit higher possibility that depris inside tube goes to gun and cause short than in vertical or tube faced down. That's why tubes should store faces down.

You can also screw projector bottom to wall, so it will be easier to assemble.

CIR Engineering · Posted: Tue Sep 14, 2010 10:36 pm Post subject:

If you really have very little space it is not an idea that is out of the question.

You should use a "first surface mirror" where the metal coating is on the outside of the glass. This way the light from the projector does not have to go through the glass.

FSM's are used for good rear projection CRT projectors.

craigr

_in_peace_ · Joined: 21 Jul 2009 Posts: 152 Location: Sweden

Ok good! thank's! there is much food for thought Smile

-Pjackso · Joined: 31 Mar 2006 Posts: 791 Location: Oklahoma

Done that, works fine, still doing it.

http://archive.avsforum.com/avs-vb/showthread.php?s=9241a19a2e3ffd5163dd003a17510258&threadid=451005&highlight=Apartment

I used a normal everyday mirror (still do). People recommended to upgrade to a first-surface mirror to reduce ghosting.
Maybe I got lucky or maybe I'm just blind - but I've never noticed any problems.

Have fun!

perisoft · Joined: 29 Aug 2007 Posts: 2920 Location: Ithaca, NY

**AnalogRocks** · Posted: Wed Sep 15, 2010 2:50 am Post subject:

grogthegreat · Joined: 16 May 2007 Posts: 166 Location: San Diego, CA

I planned on doing this and spent a good amount of time building the contraption and mounting a large first surface mirror only to find that the image gets projector very high up the wall. You can't tilt the mirror more or less than 45 degrees since it prevents you from getting even focus. Run the numbers and take measurements before building so that you know it will work.
The best place to get a large high quality trapezoid shaped mirror is from a rear projection crt tv. They pop up broken on criagslist for free all the time.

Good luck!
-Grog

_in_peace_ · Joined: 21 Jul 2009 Posts: 152 Location: Sweden

What? in sweden we have two half-hour before we can go swiming Surprised

Ok anyway i also think the lenses can go "straight on" (in angle) that's good for uniform focus?

What about a curved mirror? That can generate a 4:3 phosphor to end up like 2:35.1..??
But i don't have any friends at Nasa
Neutral

ecrabb · Posted: Wed Sep 15, 2010 12:53 pm Post subject:

CIR Engineering · Posted: Wed Sep 15, 2010 1:02 pm Post subject:

Yeah, don't do a curved mirror. Just find an old broken rear projection CRT with a glass first surface mirror and use that. In the USA people throw old RP sets away or give them away often, in Sweden finding a free one might be harder though.

Obviously any mirror will work, so you can use anything, but you will get a cleaner image with a FS.

craigr

_in_peace_ · Joined: 21 Jul 2009 Posts: 152 Location: Sweden

Craigr >> I probably found one broken for 8$ (with 47" screen)
Is the mirror big enough in those old TV's?

CIR Engineering · Posted: Wed Sep 15, 2010 6:46 pm Post subject:

-Pjackso · Joined: 31 Mar 2006 Posts: 791 Location: Oklahoma

My mirror is 19"x29" (rectangle) visible reflective area. Buy a little bigger if you intend on a border to mount it - or for trimwork. I've got mine mounted as close as you can get it (about 1/2" gap between lens and mirror).

If you'd like to space your mirror a little farther away, then I recommend building the cabinet, turn on the projector (image on the ceiling), and use a piece of cardboard where the mirror would be placed. Measure the illuminated area on the cardboard.

CIR Engineering · Posted: Wed Sep 15, 2010 9:21 pm Post subject:

robin36mac · Joined: 24 Jan 2009 Posts: 46

Hi all,

So I'm not alone Smile

I've done this :

http://img13.imageshack.us/img13/1803/p1010008hr.jpg

Which PJ are you going to use ?

I use a stadart mirror, and it's good for the begining, but if you want perfect HD, you need a front surface mirror.
My mirror is 40x60cm and is a little too short (it's ok, but if I have to start again, I will redo it a little larger)

No idea how it will work with a curved screen and find a mirror that is correctly curved...

Consider also the cooling problem, my 808 is really noiser with 1080p in this position...

Robin