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JoustMods is proud to present: A significant colour and focus upgrade for your Barco 808/1208/Cine or Marquee 8xxx projector (to name a few)! This kit allows you to install HD144/145 (and HD6) lenses on any projector that normally uses HD8 lenses.
HD-144/145 lenses offer:
More accurate colours as the red and green lenses are tinted (not clear as in HD8 lenses). No more reds that look orange or greens that look yellow!
Modifications to your existing projector or lens mounts is not required. Lens flapping (scheimpflug) continues to work as before with these adapters installed. You do not have to remove your tubes to install these adapters nor do you have to take down or move your projector in any way. You simply unscrew your HD8 lenses and install the HD144/145's with these plates attached. For detailed information, see the installation instructions below.
These plates are the culmination of hundreds of hours of research and prototyping on multiple projector models.
See here for example screenshots of a Marquee 8500 using HD144 lenses with adapters running at 1080p. Better focus, better colours!
"Is changing these lenses considered an upgrade?"
"Is it worth the cost and effort?"
Yes! The difference is not subtle! Hundreds of CRT enthusiasts have been changing out their existing lenses for HD-144 or HD-145 varieties for years now. These adapters are the first cost-effective implementation available!
Some of the comments that have been noted are:
better colour due to the colour correction of the HD144 lenses
better edge focus
"Is your image smaller/larger?"
The image is the same size, but you have to move your projector closer to the screen.
Horizontal Throw Distance (HTD) formula:
HD8 lens: Face distance from screen in inches = 1.2 X (measured screen width + 9.4 Inches)
HD144 lens: Face distance from screen in inches = 1.144 X (measured screen width + 9.3 Inches)
"It is necessary to take down the video projector off the ceiling with your adapter?"
No. This adapter is bolted right on. Approximaetly 30-60 minutes of work.
You may have to reposition your projector closer to the screen however if you wish to make the most efficient use of tube phosphor. How much closer is a function of your final screen width. See the formula above.
Is the mod to the HD144 lens mounts reversible so I can use it on a NEC XG again?
If you ever wish to re-use your HD-144 or HD-145 lenses as is again, a simple washer is all that's needed to enlarge the mounting screws enough to grab the mount.
What if my tubes have tinted glycol. Can I still use these?
Yes! You can use 3 clear lenses. This way you still get the advantage of the better focus and less halo'ing found when using HD-144 or HD-145 lenses.
My locking nuts can't turn once I have the lenses in Focus.
This is normal. Because the mounting plate is moved to allow the lens to be recessed into the PJ mount, the wingnuts will interfere with the mounting plate. The solution it to leave it as a friction fit because it is very unlikly to move on its own, or replace the wingnut with a #8-32 standard nut.
My locking nuts are at the side of the lens after I mounted it. This doesn't seem right.
You mounted the lens plate 90 degrees out of phase. Note the picture below for the correct orientation of the plates flat edge with respect to the locking nut slot.
"Why is it that after I install the adapters the locking screw is at the side of the lens?"
The lens was assembled with the plate turned 90deg off. Remove the screws and turn the plate 90deg and reassemble. Install the Lens with the locking screw at the top.
HTPC screenshots - Running TheaterTek with hi-def .TS movies at 1080p/48Hz:
(Check out how sharp the text is in the last shot!)
Xbox360 running HD-DVD at 1080p/60Hz:
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Last edited by Joust on Wed May 09, 2007 4:41 pm; edited 1 time in total
Joined: 06 Mar 2006 Posts: 12331 Location: Ottawa, Canada
TV/Projector: JVC DLA-RS56
Link Posted: Wed Mar 31, 2010 5:47 pm Post subject:
Barry's informed me that he has a limited supply of the older MKI adaters that he'll let go for $100 USD. So about half the cost of the regular MKII adapters.
Here's the catch: These older adapters only work on Marquee projectors and the installation is more work as the Marquee mounting plate is modified (not the lens). Email us at firstname.lastname@example.org. for more information or if interested in placing an order.
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