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AFryia
Joined: 09 Mar 2006 Posts: 956 Location: S.E. Michigan VPH-G70Q
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Link Posted: Sun Nov 18, 2012 12:58 am Post subject: Keystone |
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I'm curious.
Does the JVC D-ILA projector have any optical keystone or lens shift or is keystone all digital?
Is a typical JVC setup for a certain projection angle 10-15 deg. maybe? Or are you forced to use digital keystone?
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CIR Engineering
Joined: 25 Aug 2008 Posts: 4264 Location: Chicago USA & Berlin Germany
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Link Posted: Sun Nov 18, 2012 3:34 am Post subject: |
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There is no optical keystone on a JVC.
Digital keystone ruins 1:1 mapping and really screws up the image quality. It should be totally avoided. The only reason it's their is so that incompetent installers can mask their incompetence.
craigr
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Last edited by CIR Engineering on Sun Nov 18, 2012 5:13 am; edited 1 time in total
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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: Sun Nov 18, 2012 5:07 am Post subject: |
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CIR Engineering wrote: | There is no optical keystone on a JVC.
Digital keystone ruins 1:1 mapping and really screws up the image quality. It should be totally avoided. The only reason it's there is so that incompetent installers can mask their incompetence.
craigr |
That's a great quote Craig!
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AFryia
Joined: 09 Mar 2006 Posts: 956 Location: S.E. Michigan VPH-G70Q
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Link Posted: Wed Nov 21, 2012 9:29 pm Post subject: |
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CIR Engineering wrote: | There is no optical keystone on a JVC.
Digital keystone ruins 1:1 mapping and really screws up the image quality. It should be totally avoided. |
Craig how is geometry maintained when mounted to the ceiling with say a 15 degree down angle?
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WanMan
Joined: 19 Mar 2006 Posts: 10273
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Link Posted: Thu Nov 22, 2012 11:13 am Post subject: |
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Screen tilt?
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CIR Engineering
Joined: 25 Aug 2008 Posts: 4264 Location: Chicago USA & Berlin Germany
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Link Posted: Thu Nov 22, 2012 6:20 pm Post subject: |
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AFryia wrote: | CIR Engineering wrote: | There is no optical keystone on a JVC.
Digital keystone ruins 1:1 mapping and really screws up the image quality. It should be totally avoided. |
Craig how is geometry maintained when mounted to the ceiling with say a 15 degree down angle? |
Usually you can use lens shift to move the image down without keystone.
craigr
_________________ *NEW JETI 1501-HiRes 2nm Spectroradiometer
JETI 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Colorimeter
X-Rite i1Pro2 Spectroradiometer & Spyder Colorimeters *For JVC auto-calibration when Klein & Jeti are not applicable
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
*NEW Light Illusion ColourSpace XPT Version β Color Calibration Software
Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
*NEW 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
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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: Thu Nov 22, 2012 7:01 pm Post subject: |
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Guys... "Optical keystone correction" IS lens shift! So, the JVC most definitely has "optical keystone correction"!
The JVC is one of the more flexible (for the price) projectors with a long zoom range of 1.4-2.8:1, plus both horizontal and vertical lens shift. All are motorized, and there's a memory save/recall so you can save presets for different size/shift of the projected image, i.e. scope and pillar-boxed 1:78 on a scope screen.
The zoom has an atypically big range of 1.4-2.8:1. The vertical lens shift range is also big - about 80% of the screen height plus or minus, and the horizontal range is 34%. Using one does reduce the range of the other, so ideally mount the projector on the screen centerline.
As Craig mentioned, there is no good reason to mount the JVC's at anything other than perpendicular to the screen, and you certainly would want to avoid any digital keystone at all costs.
There's a JVC hanging in my theater these days, so if you have questions, ask away.
SC
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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: Thu Nov 22, 2012 7:06 pm Post subject: |
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Here's a section from the JVC manual on lens shift... You can see how big the shift range is.
Happy Thanksgiving!
SC
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AFryia
Joined: 09 Mar 2006 Posts: 956 Location: S.E. Michigan VPH-G70Q
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Link Posted: Fri Nov 23, 2012 4:16 pm Post subject: |
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ecrabb wrote: | Here's a section from the JVC manual on lens shift... You can see how big the shift range is.
Happy Thanksgiving!
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SC,
Is your PJ ceiling mount? Are you using screen tilt?
When the time comes I'll be mounting on the ceiling. With that in mind based on your experience what do you feel is the best setup?
1 - 100% lens shift
2 - 100% screen tilt
3 - or some combination of both
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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: Fri Nov 23, 2012 6:20 pm Post subject: |
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Yes, mine is ceiling mounted. No tilt - my screen is exactly as it was with my g70: perfectly plumb.
Unless you specifically wanted to introduce some tilt, you wouldn't have to.
Personally, I can't really see any good reason for it, unless for instance your screen was well above the normal height relative to the viewers.
SC
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