HC4900 Tweakers and Calibration Thread - Page 4 - AVS Forum
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post #91 of 104 Old 04-10-2008, 11:25 AM
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@Turbe,

Excellent info. Thank you. I do not have any dust blobs, and I really hope I do not get any. That said, are there good instructions on how to disassemble the 4900 for cleaning should you encounter a dust blob? Pictures would be helpful as well. I remember reading about one 4900 owner who broke his PJ trying to clean it.
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post #92 of 104 Old 04-10-2008, 11:29 PM
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Is the lack of keystone correction a huge deal with this projector? To me it is the one to buy but I am not too sure about the keystone correction.

I will ceiling mount it approx. 11' from the 100' screen. The bottom of the screen will be 36" from the floor and 8" from the ceiling. The ceiling height is 7' 10".
Will the HC4900 do what I am trying to do here?

Just trying to make sure I am buying the right projector is all.
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post #93 of 104 Old 04-11-2008, 07:05 AM
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Quote:
Originally Posted by SReed1 View Post

Is the lack of keystone correction a huge deal with this projector? To me it is the one to buy but I am not too sure about the keystone correction.

I will ceiling mount it approx. 11' from the 100' screen. The bottom of the screen will be 36" from the floor and 8" from the ceiling. The ceiling height is 7' 10".
Will the HC4900 do what I am trying to do here?

Just trying to make sure I am buying the right projector is all.

The fact that this projector has a vertical lenshift feature means there is no need for any keystone correction. Having come from a keystone correction to a vertical lenshift projector such as the 4900 is a marvel to behold. Simply ensure that the projector is level (either ceiling mounted or on a flat surface) and then shift the lens either up or down. Since it is a mechanical shifting of the projected image you will see no distortion in the projected image.

The fact that it is a pixel perfect motorized shift makes for very accurate adjustments either in the vertical or horizontal plane.

This is a fabulous projector. You will not be disappointed. I am projecting on a 120" black-out-cloth DIY screen in low lamp mode and the picture is awesome (after some tweaking, calibration and adjustments).
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post #94 of 104 Old 04-11-2008, 11:28 AM
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Thanks. You put that to rest. Really new to this. Was going to get a 50" plasma for the room I am building. Never really thought about projection. I am even more excited to get the room done now. Think I'll go home tonite and hang some drywall.

So with this vertical lens shift I can project the picture anywhere on the wall , up or down, I want, right?

Does anybody think that the rebate will come back. I would have bought it during the rebate period but didn't really have my mind made up on projecctor yet and need a little money too.
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post #95 of 104 Old 04-11-2008, 04:19 PM
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Quote:
Originally Posted by SReed1 View Post

...
So with this vertical lens shift I can project the picture anywhere on the wall , up or down, I want, right?
...

According to the spec sheet here:

http://www.projectorcentral.com/pdf/..._spec_3757.pdf

vertical adjustment is +/-75% of the screen height and horz adjustment is +/- 5% of the screen width.

Full review is here:

http://www.projectorcentral.com/mits...me_theater.htm
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post #96 of 104 Old 04-19-2008, 10:09 PM
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Has anyone successfully used the "Uniformity" calibration option mentioned by turbe in the main HD4900 forum (http://www.avsforum.com/avs-vb/showt...4#post13486074?

My projector suffers from a red shift (white becomes pinkish) on the right 1/4 of the screen as compared to the rest. When I go into the hidden Function menu and turn off the Uniformity option, this light pinkish shift becomes a very significant red shift but still primary only affects the right 1/4 of the screen. If I could figure out what to do, I would like to try and rectify the remaining pink shift. It seems obvious by the drastic difference between Uniformity On and Off that Mitsubishi must have tried to calibrate it during the build process. Now I just need some details on how to use the Uniformity settings via the serial interface and hopefully also save the results if I'm successful.
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post #97 of 104 Old 04-19-2008, 10:15 PM
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Send turbe a PM and ask him.

- Claus {non-Santa model}
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post #98 of 104 Old 04-20-2008, 04:23 PM
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I have not had time to look into this more.. I know the tables exist (only available via RS232), I'm not sure yet if I have all the codes required to properly utilize that filter/adjustment(s).

I suspect that each projector is adjusted at the factory, the hidden menu option allows you to see what effect those adjustments have (by turning the option off).

I'll get back to it eventually, the Pioneer ISF Profiles are keeping me busy....

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post #99 of 104 Old 04-21-2008, 07:18 PM
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Thanks turbe. Hopefully the controls can be worked out.
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post #100 of 104 Old 05-31-2008, 12:32 PM
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Quote:
Originally Posted by POWERHUNGRY View Post

When Playing Blueray disks that I have Casino Royale, and Diehard, in action/fast moving sequences on screen I get horrible horizontal lines all across the image. However, when the sequences are stable or slow moving the picture is BEAUTIFUL.

What can I check to resolve this issue?

Thanks, for any ideas you may have!

Bill,
SLC, Utah.

I experienced a similar issue. I resolved this by calling tech support and they pointed me first to the SIGNAL menu, then to the USER submenu. There you will find an option for VERTICAL SYNC. It will either be on AUTO or OFF. Mine was having issues while OFF (screen tearing for me, which sounds similar to what you're seeing), but now it's perfect.

Try that out and see if the tearing disappears.

- James
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post #101 of 104 Old 06-18-2008, 10:44 AM
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I have a Da-Lite perforated (acoustically transparent) screen which was fine for my old AE900, but is now displaying a moire pattern with my new Mitsu 4900.

Before I look into replacing the screen (or screeen material, thinking Seymour at this point), I was wondering if there are any tweaks to the projector that I can try to eliminate the moire pattern.

What I mean by moire is, in solid color (usually bright) scenes, I see a wavy "fingerprint"-like effect. Most noticeably, I see it on the splash screen. I know this is a common issue w/ perforated screens and certain projectors. My base question is, can I try anything to correct this without replacing the screen material.
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post #102 of 104 Old 06-18-2008, 01:54 PM
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It is common for all screens with a textured surface (like the holes in your screen) - old models not designed for 1080p use. Your screen was designed for 720p PJs, and the hole spacing and size are too big for use with a 1080p PJ. This is what results in the moire pattern.

Unfortunately, your only choice is to upgrade the screen (and make sure it is designed for use with 1080p PJs).

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post #103 of 104 Old 06-19-2008, 02:55 PM
 
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Quote:
Originally Posted by dlastoria View Post

I have a Da-Lite perforated (acoustically transparent) screen which was fine for my old AE900, but is now displaying a moire pattern with my new Mitsu 4900.

Before I look into replacing the screen (or screeen material, thinking Seymour at this point), I was wondering if there are any tweaks to the projector that I can try to eliminate the moire pattern.

What I mean by moire is, in solid color (usually bright) scenes, I see a wavy "fingerprint"-like effect. Most noticeably, I see it on the splash screen. I know this is a common issue w/ perforated screens and certain projectors. My base question is, can I try anything to correct this without replacing the screen material.

Nothing you can do, unfortunately. I had to rotate my SMX screen about 15 degrees to eliminate moire.
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post #104 of 104 Old 07-16-2008, 08:31 AM
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If anyone wants them, the Display Profile for ControlCAL to change the Reference Color Temp Presets is available.

Please Note: I did not include the RGB Controls to change the sought after High Brightness Preset(s) (It's not ready)...

You would need to change the the proper Preset, then change the Reference Values.

FIRST, you should REFRESH and write down your Projector's Factory Calibrated/Saved Settings for all 9 Controls' Values (no need to write down the Gamma Control Values)......

This requires the Serial Cable that came with your Projector. If you PC doesn't have an available Serial/RS232 Port (or non at all), ControlCAL does support the Keyspan USB to Serial Adapter.








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