| Author |
Message |
km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
|
| Posted: Sat Oct 30, 2010 9:33 am Post subject: Lens Flapping Advice |
|
|
I know all of the top end 9" PJs have lens flapping but is it really necessary if you can get your PJ parallel to the screen how much difference does it make?
I am building a PJ with different tubes and can either go with or without lens flapping and don't have lens flapping on my current PJ and since there is a fair bit of work if I go with lens flapping I thought I would ask for some advice. 
|
|
| Back to top |
|
 |
Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
|
| Posted: Sat Oct 30, 2010 12:00 pm Post subject: |
|
|
|
No difference if tubes are glued to correct angle to hardware, but usually they are not. With flapping you are not tied to one projection distance and projection angle like with glued tubes.
|
|
| Back to top |
|
|
Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
|
| Posted: Sat Oct 30, 2010 1:20 pm Post subject: |
|
|
|
10PG's don't have lens flapping and it doesn't prevent them from being dialed in for correct focus across the screen. The caveat is that if you do NOT have lens flapping, then you must place your projector relative to your screen absolutely perfectly, there is no compromise if you don't have lens flapping.
|
|
| Back to top |
|
|
km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
|
| Posted: Sat Oct 30, 2010 11:25 pm Post subject: |
|
|
|
So the problem is actually two fold. The projector needs to be parallel to the screen and the tubes need to be glued correctly I gues parallel to the back of the lens and since I have to clue the tubes there is room for error. OK so we go with lens flapping I have two lens flapping systems one from an Ampro and some of the parts from a Sony 1292 is there anything wrong with either of these as I am using Sony tubes?
|
|
| Back to top |
|
|
Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
|
| Posted: Sun Oct 31, 2010 9:27 am Post subject: |
|
|
| km987654 wrote: | | the tubes need to be glued correctly I gues parallel to the back of the lens and since I have to clue the tubes there is room for error. |
If tubes are glued parallel, flapping is good only for green tube when projector is installed on axis projection. So that tubes/lenses are installed to zero angle in center of screen, but still R/B have incorrect horizontal flapping.
Here is more info.
http://www.curtpalme.com/forum/viewtopic.php?p=71690
|
|
| Back to top |
|
|
km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
|
| Posted: Sun Oct 31, 2010 9:12 pm Post subject: |
|
|
| Ile wrote: | | km987654 wrote: | | the tubes need to be glued correctly I gues parallel to the back of the lens and since I have to clue the tubes there is room for error. |
If tubes are glued parallel, flapping is good only for green tube when projector is installed on axis projection. So that tubes/lenses are installed to zero angle in center of screen, but still R/B have incorrect horizontal flapping.
Here is more info.
http://www.curtpalme.com/forum/viewtopic.php?p=71690 |
While I like the idea of not bothering with lens flapping the degree of accuracy required to get a sharp image is beyond me. If I had factory mounted tubes I would feel more comfortable but since I have to mount all the tubes again then I would like the ability to correct any issues that have been pointed out.
So is there any problem using either the Ampro or Sony 1292 lens flapping setup 
|
|
| Back to top |
|
|
km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
|
| Posted: Sun Nov 14, 2010 7:35 am Post subject: |
|
|
|
Any feedback here. Thanks guys.
|
|
| Back to top |
|
|
km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
|
| Posted: Wed Nov 17, 2010 6:20 am Post subject: |
|
|
|
Did I read somewhere on this forum that Ampro LC tanks are only good on an Ampro something about the tank shape??
|
|
| Back to top |
|
|
km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
|
| Posted: Sun Nov 21, 2010 9:06 am Post subject: |
|
|
|
I am now leaning towards the advice Ile gave and not bother with lens flapping as all the lens flapping soltions have some sort of bellows that will leak and I am unsure about the Ampro solution. The Barco non lens flapping solution has external hoses that can easily be replaced I just need to get the tubes mounted properly.
|
|
| Back to top |
|
|
Gerbrand
Joined: 13 May 2008
Posts: 199
|
| Posted: Sun Nov 21, 2010 3:42 pm Post subject: |
|
|
I just went through the whole exercise of mounting the tubes with the proper Scheimpflug. I have a topic about it: https://www.curtpalme.com/forum_archived/viewtopic.php@t=21765.html.
I had a special tool made to measure the settings of the old tubes and transfer that to the new tubes. Actually I found that the original SP was incorrect for my screen size, so I calculated the proper settings and used that.
Unfortunately I cannot tell yet if it all worked.
Gerbrand
_________________
BG1209s (color filtered,new LUGs!), 13000h
Bat cave
|
|
| Back to top |
|
|
|
|
