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benareeno
Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada
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Link Posted: Mon Sep 09, 2013 10:48 pm Post subject: any hacks which would allow me to increase throw? |
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I have filtered lenses, and I find i prefer the projector behind me as opposed to above or in front...or beside me. If I could increase the throw...it would be just right.
I don't suppose there are any optical hacks one could do?
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ecrabb Forum Moderator
Joined: 13 Mar 2006 Posts: 15909 Location: Utah
TV/Projector: JVC RS40, Epson 5010
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Link Posted: Mon Sep 09, 2013 11:09 pm Post subject: |
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Nope. If throw increases, so does screen size. Linear relationship. The only thing you can do is make the image smaller on the tube face (which is really only reasonable for a few percent one way or the other, can soften the image, and wears the phosphor.
What projector, and what's your current screen size and throw? Can you rearrange your room a little to move the couch closer? My G70 was behind my head, but I my seat was at about 1.2 or 1.3 screen widths... The projector was probably 1.4 or 1.5 screen widths.
Placement flexibility is another very nice thing about digitals.
SC
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CasetheCorvetteman
Joined: 09 Nov 2008 Posts: 6319 Location: Australia
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Link Posted: Mon Sep 09, 2013 11:49 pm Post subject: |
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You dont say what lenses. Lots of them are filtered.
Placement of digitals must be absolutely exact if they have no zoom or lens shift. Without the latter, they still need to be centered perfectly. CRT is no where near that absolute critical, even if it does help to be.
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AnalogRocks Forum Moderator
Joined: 08 Mar 2006 Posts: 26690 Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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Link Posted: Mon Sep 09, 2013 11:59 pm Post subject: |
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Move the screen not the projector
_________________ Tech support for nothing
CRT.
HD done right!
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benareeno
Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada
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Link Posted: Tue Sep 10, 2013 2:07 am Post subject: |
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I know the simple basics...I was looking to see if some phyisics guru or one of the brainiacs could come up with an interesting option. I think it would certainly be worth a try. Either longer or shorter throw would be good. I have the projector just behind me right now...and its right in the middle of the screen so no keystoning is necessary. THe screen is just a tad too small if I want to run a relatively normal raster. I have the hwidth almost at zero now (but the image is not as small as I would have thought on the tube face).
The lenses are hd6ml...I quite like them, actually. Is the throw on these lenses longer/shorter than HD145's?
Of the lenses I could use, I wonder which ones would have the longest throw...I might have to check that lenses thread.
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CasetheCorvetteman
Joined: 09 Nov 2008 Posts: 6319 Location: Australia
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Link Posted: Tue Sep 10, 2013 2:25 am Post subject: |
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HD6 are simular to 145, but try those anyway. 144 will put the projector closer.
There is no magic tricks to change throw distance, and if its on the ceiling, its no big deal anyway.
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benareeno
Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada
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Link Posted: Tue Sep 10, 2013 2:38 am Post subject: |
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it's funny...everything is a tradeoff...I find ceiling mount makes the projected image too high...floor mount, too low. Front of my seating area, pic too small, behind seating area, pic too big!!
Ahhhh....crt. Why do I love thee so??
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ecrabb Forum Moderator
Joined: 13 Mar 2006 Posts: 15909 Location: Utah
TV/Projector: JVC RS40, Epson 5010
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Link Posted: Tue Sep 10, 2013 4:24 am Post subject: |
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Like I said, from my recollection, no lenses change the throw more than few percent from any other lens (assuming same projector/lens compatibility; obviously, there are differences between small machines and large machines). So, unless moving the projector an inch or two is all you need, lenses aren't an option.
http://www.avsforum.com/t/131006/hd145-vs-hd-6c-lenses
HJustin wrote: | The focal lengths of the HD6 and the HD145:
HD6: 133.4mm
HD145: 134.1mm
I received this information from Barb at Corning Precision Lens last week. I assume from this information there would be practically no difference in throw distance between the two. |
He's right.
You still haven't mentioned your screen size or viewing distance.
If ceiling mounting is making the image too high, it sounds like maybe your whole problem is too small of a screen. Pull the projector back, the screen gets a little bigger, the offset drops it down on the wall, and all is right with the world.
SC
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CasetheCorvetteman
Joined: 09 Nov 2008 Posts: 6319 Location: Australia
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Link Posted: Tue Sep 10, 2013 6:24 am Post subject: |
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Either that or mount the machine abit lower, or tilt more. There should be more than enough range in the convergence to tilt it dowward more, and it wont take much.
There is a load of solutions here.
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joatmon
Joined: 17 Mar 2009 Posts: 127 Location: Ottawa, Ontario
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Link Posted: Wed Sep 11, 2013 5:09 pm Post subject: |
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I have my 708/Cine7/DTV940 on the ceiling and it works just peachy up there (and yeah, I like to sit just a bit in front of it too).
(old photo - before I lowered it about 6-8" and moved it back about 4")
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benareeno
Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada
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Link Posted: Wed Sep 11, 2013 9:12 pm Post subject: |
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Joatmon,
what kind of mount are you using? The Barco one, or uni-strut? If uni-strut, how are you doing it?
If you're inclined...I'd love to see this setup in action. Plus, it would allow me to copy the remote codes to a learning remote. I am remoteless and have to stand at the projector in order to change anything
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joatmon
Joined: 17 Mar 2009 Posts: 127 Location: Ottawa, Ontario
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Link Posted: Wed Sep 11, 2013 10:08 pm Post subject: |
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benareeno wrote: | Joatmon,
what kind of mount are you using? The Barco one, or uni-strut? If uni-strut, how are you doing it?
If you're inclined...I'd love to see this setup in action. Plus, it would allow me to copy the remote codes to a learning remote. I am remoteless and have to stand at the projector in order to change anything |
Yes, I can have you over. How's tomorrow evening between 8-10pm?
I do have the original Barco remote as well. That's a pain setting it up the way you have been.
I have the Barco OEM mount attached to uni-strut. I originally had the uni-strut bolted to the structural members of the house, but months later realized I had screwed it up and lowered the whole assembly by inserting wood blocking between the ceiling and the uni-strut.
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benareeno
Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada
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Link Posted: Wed Sep 11, 2013 10:49 pm Post subject: |
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I have that Barco mount...it's a tad confusing for me. It didn't come with any bolts, and I don't want the thing falling on my head because I forgot a bolt It would be good to look at yours.
Tomorrow may or may not be good...I may have to babysit I'll pm you here tomorrow.
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