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HC4900 Tweakers and Calibration Thread - Page 2

post #31 of 104
I just ordered one of these, any input on how an NS lens will help any black issues?
post #32 of 104
Quote:
Originally Posted by Dugout Doug View Post

I just ordered one of these, any input on how an NS lens will help any black issues?

What's an NS lens? If you mean Doug a ND filter (Neutral Density) all that does it cut-down on light output; sure it darkens blacks but it darkens EVERYTHING!

Obviously some here like it, but unless you have too much light output for your screen, and want to drop it down a bit then take it off as the lamp ages, I see no benefit to it.

Black issues? I watched 2001: a space odyssey HD DVD recently and it looked way better than 95% of commercial theater presentations and I've seen almost 100 of these in my life (yeah have been a fan since 1968). Try-it-you-may-like-it.
post #33 of 104
Quote:
Originally Posted by Laserfan View Post

What's an NS lens? If you mean Doug a ND filter (Neutral Density) all that does it cut-down on light output; sure it darkens blacks but it darkens EVERYTHING!

Obviously some here like it, but unless you have too much light output for your screen, and want to drop it down a bit then take it off as the lamp ages, I see no benefit to it.

Black issues? I watched 2001: a space odyssey HD DVD recently and it looked way better than 95% of commercial theater presentations and I've seen almost 100 of these in my life (yeah have been a fan since 1968). Try-it-you-may-like-it.

Its right next to the "D", and yes I ment ND.

Thanks man, really, you are a asset to this projector, I beem reading your posts for about 4 days straight before buying it.

I also would like to try your calibration settings.
post #34 of 104
Quote:
Originally Posted by Dugout Doug View Post

I also would like to try your calibration settings.

Thanks for your kind words! Honestly Doug my settings are mostly irrelevant to you, as are any of the others' you might find here, because noone here has the exact same pj, positioning, screen type/size/material, sources (dvd player etc.), and ambience (wall/floor/ceiling coloration, lighting type & location), and maybe finally "taste" in what looks good to us.

Having said all that my main source is an XA2 connected via HDMI, with Enhanced Black setting On and I think I have brightness under its Picture settings at +1. As for the 4900 I have virtually every setting at factory (Auto, temp at Medium) except Focus which I set a few (4 or 5) ticks off from perfect sharp. Now that I think of it I am using AV Memory 1 so I may have tweaked a brightness or contrast, but nothing magical for sure. My lamp is set to Low; I only use my PJ to watch movies in the dark. No daytime/lighted viewing ever, nor games or other e.g. as PC monitor.

My 4900's colors were perfect OOBox; I've only had to put-up the THX black level screen from a THX SD DVD to look at (and make disappear) the drop-shadow and box 7 and that's it. I have a bright white screen and a "bat cave" room.

I hope you like the 4900; I think it's a great pj, and the ridiculous price is a huge bonus!
post #35 of 104
I have a Da-Lite B Pulldown on the way, 92 inch. I will be watching at night, in a very dark room too, so I will be ok with the low setting for the lam, good to know. 5k hours is nice!
post #36 of 104
Quote:
Originally Posted by bayn View Post

In case this helps anyone with their tweak settings I just posted this in the 4900 owners thread:
=======================
Ok,
So I started messing around with settings a bit more and increased by black level quite a bit. First I used Robz setting as a base which worked well, then I remembered, at least on my source (PS3) the HDMI settings.

Under "Display Settings -> RGB Full Range HDMI" there are two settings, one is limited and the other is full. Just for fun mine was set to limited (for my television) and I changed it to "Full" which immediately blacked everything up (a bit crushing IMO) then on the PJ I changed my "Input Level" to "Enhanced" and that really added some black and brought back the detail. Its a very visible switch between the two "Full and Limited" setting for my HDMI line.

Perhaps what we are dealing with is some sources sending "limited" signals vs. "full"? (Possibly burried in their menus?) Still don't know if this is "inky" enough for some but I think it added a whole other shade level that might help a few out. And i'm sure this will only help those with a PS3 as a source but who knows if other sources have this option.

I have my XA2 2.8fw set to Enhanced RGB and am connected via HDMI yet the HC4900 signal input level enhanced option is greyed out. Is there another setting that to make so I can get to this?
post #37 of 104
check out my cheap filter mod
3 hours now and no dust blobs--normal fan function, I think.
http://picasaweb.google.com/imuesmai...ey=MwfjsNigG8w
The filter pack is a cheap electrostatic vent filter.
gasdoc
post #38 of 104
Quote:
Originally Posted by imuesmail View Post

check out my cheap filter mod
3 hours now and no dust blobs--normal fan function, I think.
http://picasaweb.google.com/imuesmai...ey=MwfjsNigG8w
The filter pack is a cheap electrostatic vent filter.
gasdoc

Interesting... did you check your fan mode before and after this mod? I for some reason am hell bent on finding an add-on filter tweak that doesn't raise the fan mode higher than 10, but yet is more effective than the pantyhose trick. I have no idea why I have targeted that number but I guess it is a starting point for me. I didn't have a good feeling about the ~50 that RobZ was getting with that Bissell filter. Rob then got ~15 for fan mode for using just the paper from the Bissell filter if I remember correctly.

Good work all!!
post #39 of 104
Quote:
Originally Posted by gottahavapj View Post

Interesting... did you check your fan mode before and after this mod? I for some reason am hell bent on finding an add-on filter tweak that doesn't raise the fan mode higher than 10, but yet is more effective than the pantyhose trick. I have no idea why I have targeted that number but I guess it is a starting point for me. I didn't have a good feeling about the ~50 that RobZ was getting with that Bissell filter. Rob then got ~15 for fan mode for using just the paper from the Bissell filter if I remember correctly.

Good work all!!

The included filter is so incredibly cheap--its just foam---that I did not even want to turn the pj on without the mod the 1st time. BTW, how do you check fan speed, etc?
I am loving my pj. How can we use a blu-ray disc with hidden calibration signals?
Thanks,
gasdoc
post #40 of 104
I finally ordered my HC4900, and looking forward to modding it. I'm not too queasy about messing with it either, since I have done the dreaded light tunnel fix on my SP4805.. so I feel I can take on anything.

Have we determined which way is the best to attach the HEPA filter mod? It seems like some have it stuck on the outside, and some have replaced the crummy foam with the hepa. My question is this.

If you replace the foam, how are you sealing the edges of the HEPA filter inside the little plastic bracket?

One more question - does the sticking spray for the foam filter reduce the airflow in any way?

Has anyone combined the sticky spray and a hepa filter

Oh, and my screen is a 102" diag DIY with Black out fabric. I'll post my settings wonce I run the HC4900 through Avia once. (Though it is only SD)

Thanks in advance,
Mike
post #41 of 104
I'm at 35 hours and thankfully no dust blobs...yet.
I am using the WEB Filter Charger spray on the original Mits filter (see my previous posts in another thread) and one of those WEB cheap electrostatic vent filters (like imuesmail) over the outside (also sprayed with sticky stuff). I did this before I ever turned on the projector. Used black electrical tape to hold it in place. Also covered a small hole on the bottom and at the rear. Haven't checked fan speed etc BUT I don't think this is adding any more material to restrict airflow than Mit's own 6000 filter.

I have added a small Surround Air ionizer next to the projector-one that doesn't blow air but uses natural convection. Didn't like the idea of a fan blowing things around BUT another AVSer posted a fan might be the solution. I think he said that blowing air from a HEPA air cleaner into the Mits filter would create a negative vacuum. Not sure if I have all that correct but don't have time to try and find the post right now.

It seems odd that people are having dust blob problems when supposedly Mits added some kind of dust protection to the lcd panels; at least I think the 5000 or 6000 has this. Anyway, that's what was on the cine4home review.

Good luck to all who dare to beat the technology. Again, I'm knocking on wood, praying (yes, I'm a believer but find it hard to believe God could care about this stuff), and hope I'm not being too cocky.
post #42 of 104
Quote:
Originally Posted by imuesmail View Post

check out my cheap filter mod
3 hours now and no dust blobs--normal fan function, I think.
http://picasaweb.google.com/imuesmai...ey=MwfjsNigG8w
The filter pack is a cheap electrostatic vent filter.
gasdoc

Where do you buy the vent filter?
post #43 of 104
This morning the PJ picture went to "x-ray" look then there was a symbol similar to a double quotation mark (").

What does this mean? I have a HC6000, but there is very little activity over at that thread.
post #44 of 104
Quote:
Originally Posted by muadib View Post

Where do you buy the vent filter?


A local Meijers store in Michigan--its a Midwest Chain. But I have seen this electrostatic vent filters in most big chain hardware stores e.g. Home Depot, Lowes, etc. Its really cheap in price, but appears to be better than the foam filter that comes with the 4900.

I don't think the mod is impeding any air flow as I can't hear the fan in Low Lamp mode, but I certainly can feel the warm air coming out. I do hear the fan when I go to the Normal Lamp Mode.

I would not turn on the pj even the 1st time without this added protection. The filter on the 4900 is really cheap looking gray foam.

About 20 hours with the mod and no dust blobs. On my Sanyo Z2 I got dust blobs within 3 months, but even 4 years later they rarely bothered me much---99% of the time I couldn't even see them.

I love my Mits 4900---I am glad I upgraded from my beloved Z2.

Gasdoc
post #45 of 104
Quote:
Originally Posted by imuesmail View Post

The included filter is so incredibly cheap--its just foam---that I did not even want to turn the pj on without the mod the 1st time. BTW, how do you check fan speed, etc?
I am loving my pj. How can we use a blu-ray disc with hidden calibration signals?
Thanks,
gasdoc

Sorry- I missed your question here.

Menu>Feature Menu>Arrow down to Menu Position>Enter>AP (auto postion)>Enter>Auto Position.

This will show you what I think someone called the service information menu. What is your fan mode reading on the last line with these filters in place? I have never seen mine climb above 2 with the stock filter. I've seen reports of as high as 50 with filter add ons.

Cheers!

BTW- 166 hours on the stock filter and no dust blobs that I can see. Knocking very firmly on some wood.
post #46 of 104
Quote:
Originally Posted by imuesmail View Post

A local Meijers store in Michigan--its a Midwest Chain. But I have seen this electrostatic vent filters in most big chain hardware stores e.g. Home Depot, Lowes, etc. Its really cheap in price, but appears to be better than the foam filter that comes with the 4900.

I don't think the mod is impeding any air flow as I can't hear the fan in Low Lamp mode, but I certainly can feel the warm air coming out. I do hear the fan when I go to the Normal Lamp Mode.

I would not turn on the pj even the 1st time without this added protection. The filter on the 4900 is really cheap looking gray foam.

About 20 hours with the mod and no dust blobs. On my Sanyo Z2 I got dust blobs within 3 months, but even 4 years later they rarely bothered me much---99% of the time I couldn't even see them.

I love my Mits 4900---I am glad I upgraded from my beloved Z2.

Gasdoc

I'll see if I can find some at Home Depot today. Thanks!
post #47 of 104
Quote:
Originally Posted by gottahavapj View Post

Sorry- I missed your question here.

Menu>Feature Menu>Arrow down to Menu Position>Enter>AP (auto postion)>Enter>Auto Position.

This will show you what I think someone called the service information menu. What is your fan mode reading on the last line with these filters in place? I have never seen mine climb above 2 with the stock filter. I've seen reports of as high as 50 with filter add ons.

Cheers!

BTW- 166 hours on the stock filter and no dust blobs that I can see. Knocking very firmly on some wood.

Thanks, I will check next time. I enjoyed watching "The Shooter" SDDVD--much better than i remember seing it of my Z2.
gasdoc
post #48 of 104
Quote:
Originally Posted by gottahavapj View Post


Menu>Feature Menu>Arrow down to Menu Position>Enter>AP (auto postion)>Enter>Auto Position.

Sorry my 4900 doesn't respond to 'Enter' when I select Menu>Feature Menu>Arrow down to Menu Position. I can only use left/right arrow to move the menu either to the upper left or lower right coner. What is wrong with it?
post #49 of 104
i just got my HC4900 last night. I bought a Bissel 8 filter and put it on top of the original filter the pj came with. I am a little concern about heat b/c hepa filter seems pretty thick.

But I saw a lot of other vents and openings on the pj.
Do I need to put a filter on those openings also?
post #50 of 104
I have a 1500, would it be worth it to replace it with the 4900 ?
I'm thinking about pulling the trigger and getting the 4900 ... any thoughts ?
post #51 of 104
Quote:
Originally Posted by gottahavapj View Post

Menu>Feature Menu>Arrow down to Menu Position>Enter>AP (auto postion)>Enter>Auto Position.

Quote:
Originally Posted by jeffreydeng View Post

Sorry my 4900 doesn't respond to 'Enter' when I select Menu>Feature Menu>Arrow down to Menu Position. I can only use left/right arrow to move the menu either to the upper left or lower right coner. What is wrong with it?

There's no visible reacton to pressing "Enter" in this sequence. Just press the keys on the remote in the order gottahavapj indicated and the "hidden" information menu will pop up (although I don't think the last "Auto Position" key press is needed). Hit the menu or exit button on the remote to close the pop up.
post #52 of 104
Have any fellow owners experimented with both the ND and the CC20R filters? And if so, what did you find produced the best results? I will be getting both tomorrow, just wanted other opinions.....

Best,
Patrick
post #53 of 104
Quote:
Originally Posted by Terpsfan View Post

There's no visible reacton to pressing "Enter" in this sequence. Just press the keys on the remote in the order gottahavapj indicated and the "hidden" information menu will pop up (although I don't think the last "Auto Position" key press is needed). Hit the menu or exit button on the remote to close the pop up.

Appreciate the answer and I will try it tonight.
post #54 of 104
Looking to improve the contrast/haze on the HC4900, I did my iris tweak.



Contrast readigs taken facing projector:
(projector is 10.8" from 100" screen)

Before - low bulb
* Medium temperature
- On/Off = 500:1
- On/Off iris2 = 3450:1
- Ansi = 163:1

* Cool temperature
- On/Off = 568:1
- On/Off iris2 = 3980:1
- Ansi = 175:1

After
* Medium temperature
- On/Off = 830:1 (low bulb) 855:1 (standard bulb)
- On/Off iris2 = 4770:1
- Ansi = 150:1

* Cool temperature
- On/Off = 930:1 (low bulb) 970:1 (standard bulb)
- On/Off iris2 = 5300:1
- Ansi = 153:1

* High Brightness (not color corrected)
- On/Off = 1400:1 (low bulb) 1425:1 (standard bulb)
- On/Off iris2 = 8000:1
- Ansi = 153:1

* User1 D65 color corrected
- On/Off = 830:1 (low bulb) 855:1 (standard bulb)
- On/Off iris2 = 4840:1
- Ansi = 146:1

As far as how much brightness was lost, I calculated close to 20%. Image still punchy though thanks to increase contrast. Standard bulb gives more punch if needed. Black level (iris open) was cut in half from about .250ftL(.855 cdm2) to .121ftL(.415 cdm2) after iris tweak. Picture depth is much improved getting rid of the haze on low APL mixed scenes. Dark scenes are now more satisfying than ever before! I can enjoy dark content without the dreaded flatness. Pitch black scenes while obviously do not reach pure black, they are much better as well. Bright content looks as good as before. For more brightness, I can use standard bulb with slight bump in contrast as well! Although measurements showed that ANSI contrast went down a bit, my eyes tells a different story with improved depth.

This scene (Blade 2) was shot with identical exposure times to show the difference. Iris open was used.



My next "to do" is finding filters to improve "High Brightness" color and hopefully retain its higher contrast. I've tried an 81D warming filter and while it brings blue level down to red level, green remains high and unaffected. Wonder if a CC20R lowers both green and blue.
post #55 of 104
Looks pretty incredible HDholic, congratulations! But...

...now of course we NEED DETAILS of what the heck you did, and how you did it!

Did you paint a washer, how was the 4900 to get apart, position the thing, c'mon, all that stuff. With pictures!
post #56 of 104
Quote:
Originally Posted by Laserfan View Post

Looks pretty incredible HDholic, congratulations! But...

...now of course we NEED DETAILS of what the heck you did, and how you did it!

Did you paint a washer, how was the 4900 to get apart, position the thing, c'mon, all that stuff. With pictures!

Agreed. I am pretty amazed by the difference. Also, what was the source material? My HD content does not seem to be as washed out looking as yours was after I tweaked my settings.
post #57 of 104
Quote:
Originally Posted by Laserfan View Post

Looks pretty incredible HDholic, congratulations! But...

...now of course we NEED DETAILS of what the heck you did, and how you did it!

Did you paint a washer, how was the 4900 to get apart, position the thing, c'mon, all that stuff. With pictures!

Quote:
Originally Posted by ack_bk View Post

Agreed. I am pretty amazed by the difference. Also, what was the source material? My HD content does not seem to be as washed out looking as yours was after I tweaked my settings.

Laserfan, my weapon of choice was aluminum foil! I didn't see how it's possible to attach a washer in front of the lens. It's flat. The foil wraps around the zoom lens. It may seem daunting or impossible but it actually wasn't bad at all, at least to me . I could write up something if there's a lot of interest.

ack-bk, the shots were from Blade 2 SD DVD. I like its mixed scenes, perfect as a test bed. Keep in mind Iris was Open.
post #58 of 104
Count me in as an interested party
post #59 of 104
Quote:
Originally Posted by HDholic View Post

Laserfan, my weapon of choice was aluminum foil! I didn't see how it's possible to attach a washer in front of the lens. It's flat. The foil wraps around the zoom lens. It may seem daunting or impossible but it actually wasn't bad at all, at least to me . I could write up something if there's a lot of interest.

Omigosh aluminum foil!

Well, I guess for starters you could tell us where in the lens chain you foiled the thing--at the very start? I'm not much with scissors, though I guess we don't need a perfectly round hole.

Wondering too how you decided how big to make the hole--I mean, did you just fiddle with it until it showed on the corners of the projected image, then back-off from there, or what? Was it hard to take apart and get at?

You're acting pretty blase about this--some of us are very impressed. You're a brave man, sir!
post #60 of 104
I'm all ears as well....
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