| Author |
Message |
fragzero
Joined: 30 Aug 2012
Posts: 344
|
| Posted: Fri Oct 18, 2013 1:23 pm Post subject: Reducing the angle - worth it? |
|
|
Currently using a 1208 with 2x high res and 1x low resolution tube.
I could quite easily reduce the angle from the standard 10.5 degrees to near 0 (i mounted my screen a little high) with almost no effort at all (I even have all the materials required).
I have read about this, i have seen people mention it is possible but is it worth doing? How is the stress on the electronics? I have stepless scheimfplug so that's fine.
Does anyone have any experiences with this, I'm pursuing 1080p48 so any increase in sharpness would be great. 
|
|
| Back to top |
|
 |
CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
|
| Posted: Fri Oct 18, 2013 2:57 pm Post subject: |
|
|
Well, when you do that you wind up needing less keyston so the sides of the image can become straighter on the tube face. This allows you to use more phosphor area, which allows you to move the projector closer to the screen, which will increase brightness and some sharpness. It is a nice tweak if you can do it.
I try and get my clients to mount CRT projectors with some pitch to the screen to help reduce the amount of keystone required.
craigr
_________________
JETI 1501-HiRes 2nm Spectroradiometer
JETI 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Colorimeter
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
Light Illusion ColourSpace XPT Color Calibration Software
Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
OMARDRIS JVC Software Patch to use K10-A and Jeti with JVC OEM AutoCal Software!
Sencore CR7000 CRT Tube Analyzer / Rejuvenater
Authorized Dealer for Lumagen & just about everything worth buying 
www.CIR-Engineering.com - craigr@cir-engineering.com
Phone: 865-405-6892
|
|
| Back to top |
|
|
fragzero
Joined: 30 Aug 2012
Posts: 344
|
| Posted: Fri Oct 18, 2013 3:09 pm Post subject: |
|
|
|
Ah thanks for the advice! Now i'm convinced i should try this!
|
|
| Back to top |
|
|
CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
|
| Posted: Fri Oct 18, 2013 3:13 pm Post subject: |
|
|
Check the keystone range your projector has before you go all out.
craigr
_________________
JETI 1501-HiRes 2nm Spectroradiometer
JETI 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Colorimeter
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
Light Illusion ColourSpace XPT Color Calibration Software
Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
OMARDRIS JVC Software Patch to use K10-A and Jeti with JVC OEM AutoCal Software!
Sencore CR7000 CRT Tube Analyzer / Rejuvenater
Authorized Dealer for Lumagen & just about everything worth buying
www.CIR-Engineering.com - craigr@cir-engineering.com
Phone: 865-405-6892
|
|
| Back to top |
|
|
fragzero
Joined: 30 Aug 2012
Posts: 344
|
| Posted: Fri Oct 18, 2013 3:20 pm Post subject: |
|
|
| CIR Engineering wrote: | Check the keystone range your projector has before you go all out.
craigr |
Thanks for the tip, with my current Unistrut setup + rope and Pulley setup i can very easily lower my projector and test how far i can go!
|
|
| Back to top |
|
|
garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
|
| Posted: Fri Oct 18, 2013 5:38 pm Post subject: |
|
|
|
Also check to see if you already have keystone-shaped wear on your tubes... If you had to reduce your image size to fit the new rectangular image inside the wear zone, you'd be losing ground.
|
|
| Back to top |
|
|
thewolfman
Joined: 28 Mar 2011
Posts: 1311
Location: Sweden
|
| Posted: Fri Oct 18, 2013 6:27 pm Post subject: |
|
|
| fragzero wrote: | | CIR Engineering wrote: | Check the keystone range your projector has before you go all out.
craigr |
Thanks for the tip, with my current Unistrut setup + rope and Pulley setup i can very easily lower my projector and test how far i can go! |
I would love to see a picture of your raising/lowering mechanism. I have mine uninverted in chains hanging almost in the exact middle. Once I get my pj sorted out I will raise it to an exact 90 degree angle. A little to low now with like 10 cm. Doesn't stop me from getting banding tho.. but that of course could be a fault coming from myself and my ways off setting things up. I would love to buy a new CLM with the Marquee Anti Banding done to it so I wouldn't have to bother with that anymore. If it dose work that well that is.. sadly not available anymore. Back in the day, how much did that cost to fix btw.?
|
|
| Back to top |
|
|
CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
|
| Posted: Sat Oct 19, 2013 2:38 am Post subject: |
|
|
Ive always had the CRT in my bedroom set up that way, almost zero keystone. Dont forget the lens flapping afterwards.
_________________
Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...
RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 7.1...
|
|
| Back to top |
|
|
fragzero
Joined: 30 Aug 2012
Posts: 344
|
| Posted: Sat Oct 19, 2013 3:47 pm Post subject: |
|
|
A picture isn't really needed, i have a basic unistrut setup, 2 rails vertical 2 horizontal, projector attached with threaded rods. I just attach a pulley to the unistrut, a rope to my projector and i lower or raise it (i have 2 locking pullies).
I just had a chance to lower my projector and do really rough geometry. Actually using quite a lot more phosphor! (0 degrees currently)
|
|
| Back to top |
|
|
|
|
