Official JVC RS20 / HD750 Calibration and CMS thread - Page 59 - AVS Forum
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post #1741 of 1782 Old 10-17-2010, 12:34 PM
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Thanks, I'll d/l the AVS disc.

Jeff
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post #1742 of 1782 Old 10-17-2010, 12:57 PM
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Quote:
Originally Posted by Mike_WI View Post

Here is some info with tables and figures for my calibration showing good curves...

http://www.avsforum.com/avs-vb/showt...1#post16520531

Before Calibration:
(rounded to 1 decimal point)

IRE - dE
10 - 15.8
20 - 15.9
30 - 17.2
40 - 16.0
50 - 16.7
60 - 14.2
70 - 15.2
80 - 12.6
90 - 13.1
100 - 11.5


After Calibration:
IRE - dE
10 - 0.4
20 - 1.1
30 - 1.2
40 - 0.5
50 - 0.2
60 - 0.2
70 - 0.6
80 - 0.1
90 - 0.2
100 - 0.5


Mike

Looks great. Have you also calibrated the 5% increments? 5% is very touchy in particular, but can be tamed.
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post #1743 of 1782 Old 10-17-2010, 01:03 PM
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Craig (CIR Engineering) calibrated.
See that link/thread for more details.

Mike
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post #1744 of 1782 Old 10-25-2010, 07:44 PM
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Yes well, after all that drama, it turned out quite nicely!

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post #1745 of 1782 Old 10-25-2010, 09:26 PM
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That looks nice. How many hours on your bulb? How many hours total on the pj (if this is not your first bulb)?

That said, I'd really like to see the 5% steps in between each of those plots to know for sure, especially at 95% where the pj is prone to have gamma fall off a cliff.
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post #1746 of 1782 Old 10-26-2010, 06:15 AM
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Quote:
Originally Posted by lovingdvd View Post

That looks nice. How many hours on your bulb? How many hours total on the pj (if this is not your first bulb)?

That said, I'd really like to see the 5% steps in between each of those plots to know for sure, especially at 95% where the pj is prone to have gamma fall off a cliff.

There are about 840 hours on the bulb. We moved it to High Lamp mode. I know that we made adjustments in the projector at 5, 15 and 95, but I don't know the resolution of the graph.

Our "cliff" was at 20. We found that even a one point adjustment in contrast (or brightness, I forget) caused the cliff. From what Ryan had read, he decided to leave them at zero and go directly to gamma adjustments. He had a spreadsheet .. maybe from Tom Huffman? ... that he used in an iterative process of entering the targets, adjustments and results and then entering the subsequently generated adjustments. Each round got us closer until we achieved the results pictured. He used a spreadsheet for adjusting something else, too, maybe the primaries.

Jeff
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post #1747 of 1782 Old 10-26-2010, 06:47 AM
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Hi All

What is a good place to purchase a replacement lamp for the JVC RS-20 (i.e., Part # BHL-5010-S)? The lamp lists at $399 on the JVC web site, but it appears that an original JVC lamp can be had for about $100 less at several web retailers. However, before I purchase a lamp from one of these places, I wanted to get a recommendation from this forum.

Also, is there a general rule of thumb for when a lamp should be replaced. The RS20 is my first front projector, so I am not sure how many hours I can accumulate on the lamp before I need to replace it. I do not know if there is a single right answer to this question because I suppose it depends upon the throw distance, the intensity setting on the lamp, etc.

Thanks for your advice.

Cal68

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post #1748 of 1782 Old 10-26-2010, 07:54 AM
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Quote:
Originally Posted by lovingdvd View Post

Looks great. Have you also calibrated the 5% increments? 5% is very touchy in particular, but can be tamed.

Quote:
Originally Posted by Mike_WI View Post

Craig (CIR Engineering) calibrated.
See that link/thread for more details.

Mike
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I don't have that info.
Craig could potentially have pulled it up from files, but they may be gone now.

Mike
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post #1749 of 1782 Old 10-26-2010, 08:12 AM
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Quote:
Originally Posted by Cal68 View Post

Hi All

What is a good place to purchase a replacement lamp for the JVC RS-20 (i.e., Part # BHL-5010-S)? The lamp lists at $399 on the JVC web site, but it appears that an original JVC lamp can be had for about $100 less at several web retailers. However, before I purchase a lamp from one of these places, I wanted to get a recommendation from this forum.

Also, is there a general rule of thumb for when a lamp should be replaced. The RS20 is my first front projector, so I am not sure how many hours I can accumulate on the lamp before I need to replace it. I do not know if there is a single right answer to this question because I suppose it depends upon the throw distance, the intensity setting on the lamp, etc.

Thanks for your advice.

Cal68

I, too, am interested in expected bulb life. We switched to High Lamp mode with this calibration .. it looks great! .. and it would be nice to know when I should consider a fresh bulb.

Jeff
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post #1750 of 1782 Old 10-26-2010, 08:16 AM
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Quote:
Originally Posted by Cal68 View Post

Hi All

What is a good place to purchase a replacement lamp for the JVC RS-20 (i.e., Part # BHL-5010-S)? The lamp lists at $399 on the JVC web site, but it appears that an original JVC lamp can be had for about $100 less at several web retailers. However, before I purchase a lamp from one of these places, I wanted to get a recommendation from this forum.

Also, is there a general rule of thumb for when a lamp should be replaced. The RS20 is my first front projector, so I am not sure how many hours I can accumulate on the lamp before I need to replace it. I do not know if there is a single right answer to this question because I suppose it depends upon the throw distance, the intensity setting on the lamp, etc.

Thanks for your advice.

Cal68

Have you called Jason @ AVS?
I'm getting toward 1000 hours, so I'm interested as well.

Mike
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post #1751 of 1782 Old 10-26-2010, 08:30 AM
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Quote:
Originally Posted by Mike_WI View Post

Have you called Jason @ AVS?
I'm getting toward 1000 hours, so I'm interested as well.

Mike

Hi Mike

No, I have not called Jason. But I might do so to see what price he quotes. I'll send you a PM once I find out.

Cal68

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post #1752 of 1782 Old 10-26-2010, 09:21 AM
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Quote:
Originally Posted by Mike_WI View Post

Have you called Jason @ AVS?
I'm getting toward 1000 hours, so I'm interested as well.

Mike

Really, 1000 hours is all we should expect????

Jeff
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post #1753 of 1782 Old 10-26-2010, 10:55 AM
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Quote:
Originally Posted by pepar View Post

Really, 1000 hours is all we should expect????

Jeff

No.
I think 2000 is the estimate.
There is a thread here:
http://www.avsforum.com/avs-vb/showthread.php?t=1223098


At ~1000 hours I was just thinking of having a replacement on hand.

Mike
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post #1754 of 1782 Old 10-26-2010, 11:03 AM
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Quote:
Originally Posted by Mike_WI View Post

No.
I think 2000 is the estimate.
There is a thread here:
http://www.avsforum.com/avs-vb/showthread.php?t=1223098


At ~1000 hours I was just thinking of having a replacement on hand.

Mike

Got ya. Downside, maybe, if bulbs have warranties is that they start at purchase date ...

Jeff
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post #1755 of 1782 Old 10-27-2010, 06:16 AM
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Quote:
Originally Posted by pepar View Post

Really, 1000 hours is all we should expect????

Jeff

There is another thread on this forum on the life expectancy of JVC lamps and there seems to be a lot of posts suggesting that the lamps lose 50% of their intensity after about 500 hours. I do not have the sophisticated equipment necessary to check this out, but others seem to have done so.

Cal68

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post #1756 of 1782 Old 10-27-2010, 06:35 AM
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I refuse to replace a bulb with only ~840 hours on it. Switching to High Lamp mode "fixed" the dimness I was noticing. And the full calibration really makes the image pop.
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post #1757 of 1782 Old 10-27-2010, 06:49 AM
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Yes, you're right ! It's very bad to change the lamp near 700 hours ...

Anyway .. in my point of view in order to achieve the max performance I wish, it's not the same thing to switch the lamp to high or help the lumens needed opening the Iris ...

In my setup, the best performace I'm able to reach, and for my tastes, is with a fresh lamp, Normal lamp mode and -15 Iris set .....

So I believe I'll change the lamp in my 990, if not sold before, if I'll reach that lamp age and if the new RS60 will come too late....
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post #1758 of 1782 Old 10-27-2010, 08:21 AM
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Quote:
Originally Posted by pepar View Post

I refuse to replace a bulb with only ~840 hours on it. Switching to High Lamp mode "fixed" the dimness I was noticing. And the full calibration really makes the image pop.

I did the same thing.
Helped the brightness. Image still looks good.
In the future JVC or other projectors (even 2011 line) will have more lumens and the ability to do iris adjustments and tweak over time.

Mike
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post #1759 of 1782 Old 10-27-2010, 08:34 AM
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I'm a very happy camper with the calibration. Initially, my evaluation was exclusively with darker scenes and I had a feeling that it was still not bright enough on high lamp mode. Last night I put on Fifth Element and the scene in the desert was plenty bright. And, BTW, when Lee Loo is on the ledge and during the subsequent taxi "ride", looking down I was astounded by the detail that I had never noticed before. Layer upon layer upon layer of objects.

Jeff
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post #1760 of 1782 Old 10-27-2010, 09:44 AM
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Quote:
Originally Posted by pepar View Post

I refuse to replace a bulb with only ~840 hours on it. Switching to High Lamp mode "fixed" the dimness I was noticing. And the full calibration really makes the image pop.

In the thread discussing the lamp life in JVC projectors, there is a discussion about how the simple act of cleaning the prism inside the projector with a microfiber cloth can also dramatically improve the intensity of the light emitted by the projector. This is a low cost alternative to replacing the bulb.

Cal68

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post #1761 of 1782 Old 10-27-2010, 10:36 AM
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Quote:
Originally Posted by Mike_WI View Post

..
In the future JVC or other projectors (even 2011 line) will have more lumens and the ability to do iris adjustments and tweak over time.

Mike

Hi Mike ... not to polemize ...

In the future will hope JVC finally will be out with lampless system in order we stop to worry for lumens, color temp, gamma drift over lamp age... etc. etc..

One calibration at start and then .... stop ! During the machine life !!
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post #1762 of 1782 Old 10-27-2010, 11:13 AM
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Quote:
Originally Posted by Cal68 View Post

In the thread discussing the lamp life in JVC projectors, there is a discussion about how the simple act of cleaning the prism inside the projector with a microfiber cloth can also dramatically improve the intensity of the light emitted by the projector. This is a low cost alternative to replacing the bulb.

Cal68

Tonight I am disassembling my Panamorph lens, cleaning it and installing blackout cloth. That might be a good time to do the prism cleaning if it's not too difficult. How do I gain access to the prism?

Jeff
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post #1763 of 1782 Old 10-27-2010, 11:51 AM
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Quote:
Originally Posted by pepar View Post

Tonight I am disassembling my Panamorph lens, cleaning it and installing blackout cloth. That might be a good time to do the prism cleaning if it's not too difficult. How do I gain access to the prism?

Jeff

Unscrew the two small screws on the plastic cover on the rear, then the two screws that hold the lens assembly in. After unscrewing these, pull the handle on the lens assembly to remove it, and you will see the prism inside (it is stationary--don't try to remove it!). You can reach it with a lens cloth over a finger, or you can use the eraser end of a pencil covered by the lens cloth.

Then re-seat the lens assembly, etc., in reverse.
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post #1764 of 1782 Old 10-27-2010, 12:00 PM
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Quote:
Originally Posted by pepar View Post

Tonight I am disassembling my Panamorph lens, cleaning it and installing blackout cloth. That might be a good time to do the prism cleaning if it's not too difficult. How do I gain access to the prism?

Jeff

Hi Jeff

Let us know how it works out for you and whether you can see an improvement after the cleaning.

Cal68

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post #1765 of 1782 Old 10-27-2010, 12:36 PM
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Quote:
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Hi Jeff

Let us know how it works out for you and whether you can see an improvement after the cleaning.

Cal68

Please post results and any related questions in the cleaning thread, here: http://www.avsforum.com/avs-vb/showt...php?p=19397799 . Covers lots of questions and has lots of reported results - great resource.
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post #1766 of 1782 Old 10-27-2010, 12:40 PM
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Quote:
Originally Posted by lovingdvd View Post

Please post results and any related questions in the cleaning thread, here: http://www.avsforum.com/avs-vb/showt...php?p=19397799 . Covers lots of questions and has lots of reported results - great resource.

Cleaning thread, hmmm ....

Thanks for the link!

Jeff
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post #1767 of 1782 Old 10-28-2010, 05:03 PM
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post #1768 of 1782 Old 11-09-2010, 05:33 AM
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Getting RS20 the front of lense will be 11' from screen, screen is 106" diagnal. Is this a good distance, or if not what problems wil i have. Iwould appreciate soom help.
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post #1769 of 1782 Old 11-09-2010, 07:34 AM
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Go here - http://www.projectorcentral.com/proj...ulator-pro.cfm

Plug in your projector model and information and look at the results for your answer.

Jeff
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post #1770 of 1782 Old 12-13-2010, 01:29 PM
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Any ideas why the picture from my HD750 is razor sharp from centre to far right but the left side is more difficult to focus? I guess my pj isn't squared up properly. If so, which way should I move the projector in order to get it evenly in focus?
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