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View Full Version : Πρωτα reports για τον νεο Sharp XV-Z20000 1080p



takisot
01-11-2006, 15:01
Θετικες ειναι οι πρωτες εντυπωσεις στο Avsforum για τον νεο 1080 προβολεα της Sharp. Στα αναγραφομενα υπερ του , η πολυ καλη χρωματικη συμπεριφορα out of the box και τα καλα οπτικα:

http://www.avsforum.com/avs-vb/showthread.php?t=735221


Sharp XV-Z20000 initial impressions and numbers
I just purchased the new Sharp 1080p projector, and I thought I’d post some preliminary numbers and impressions.

Throw and lens shift

The Z20000 is a relatively long throw projector 1.85-2.5/1 screen width. It has a very flexible vertical lens shift of 1 screen height, which means that it is equally well-suited for a ceiling or a shelf installation. By default, the lens aligns with the bottom of the screen for a shelf mount and at the top of the screen for a ceiling mount. Use lens shift to adjust from there. Lens shift works like a charm, but it does reduce light output and contrast, so I’d use as little of it as is practical for your installation.

Brightness and contrast

Measuring brightness is not simple with the projector because it has so many different modes. Like the Z12000, the lamp has a Bright and a Eco + Quiet mode and it has an Iris with 3 settings, High Brightness, High Contrast, and Medium. It also has 5 Gamma presets and several Picture Modes. The default gamma setting is Standard, and since this measured a nearly perfect 2.28 I left it there. I did all my watching in the Bright lamp mode, a mode with somewhat higher fan noise, but I never found it bothersome. The Eco mode gives less fan noise , but at the expense of about 20% less light output.

All measurements are post-calibration in the Standard Picture mode with about 6" of lens shift. I’ll post back later with additional information about the other modes.

http://home.comcast.net/~tlhuffman/new_table1.gif

ANSI contrast: 416:1

The Medium Iris setting was my preferred setup. It offers a good compromise between brightness and contrast.

Color performance

The Sharp XV-Z20000 displayed the best color performance out of the box that I have ever measured. By default, the color temperature is set at 7500k. I changed this to 6500k and then measured the grayscale.

http://home.comcast.net/~tlhuffman/Z20000_RGB_before.jpg

As you can see, the default gray scale is very good. I entered the custom Gamma mode and tightened the grayscale up somewhat and achieved virtually perfect performance. I did run across one problem during this. The gray scale controls for the low end of the scale did not work. The controls are there and they respond to input, but they have no effect on measured performance. Fortunately, the performance was so good to begin with, I wasn’t too concerned with this. I expect Sharp to fix this with a subsequent firmware update, and the service menu control may work. I haven’t had a chance to try this yet.

Sharp includes a Color Management System that allows calibrators to adjust the primaries and secondaries. By default, the Sharp showed a familiar color profile: oversaturated red and very oversaturated and somewhat yellowish green.

http://home.comcast.net/~tlhuffman/Z20000_CIE_Chart-before.jpg

After making adjustments in the CMS system, I was able to get a nearly perfect color gamut.

http://home.comcast.net/~tlhuffman/Z20000_CIE_Chart-after.jpg

This is a must-have feature for obsessive tweakers. It was particularly gratifying to get accurate green for a change. I don’t think I’ve ever worked on a digital display that didn’t exaggerate green. Sharp’s color management system works exactly as advertised, and I was much more impressed with it than I was with a similar system provided by Optoma’s HD-3000 external processor (the HD81 uses this). I did have some issues with the CMS results, but I’ll not post those until I’ve had time to investigate further.

The Sharp offered no adjustments for color decoding, but the color decoding was perfect out of the box (no red push here), so this was not missed.

Optics

This projector also has the best optics I have ever encountered. There is ZERO color fringing even at the extreme corners of the screen, as shown in this image of the upper right hand corner of my screen.

http://home.comcast.net/~tlhuffman/crosshatch.jpg

In addition to vertical shift, the lens has manual zoom and focus. For convenience I would have preferred a motorized system, but on the other hand the lens assembly has a very solid and well-engineered feel. Sharp obviously devoted a lot of resources to the optical system.

White field uniformity was also very good. The brightness varies by no more than 10% across the entire screen. I measured color temperature at about 150k lower on the right side of the screen. This is a measurable difference but not one that’s visible to the naked eye (at least not to mine), even when looking at a uniformly white 80IRE field.

Problems

I ran across a few problems that I have contacted Sharp about.

As I mentioned above, the RGB Bias adjustments for tweaking the low end of the gray scale are not functioning.
Page 40 of the User Manual, the page in which these controls are discussed, is reproduced in French! This is obviously a printing error.
Some of the menu items seem to be missing. In particular, I could not figure out how to use system for storing and then recalling settings in the memory. I also did not see the option to select between SD and HD color space, which according to the manual, should have been present.
The fan noise was a little higher than I would have liked and the light output was a little lower than I would have liked. Edit: Once I reduced the amount of lens shift from 21" to 6", both the light output and contrast were improved substantially. After making this adjustment to my installation, light output is no longer a major concern for me.Subjective impressions

My first thought upon seeing the image from the projector was: “I need a bigger screen!” The high pixel count really would shine more on something bigger than my 80” wide DaLite. I spent a couple of hours looking at DVD, HD DVD, and broadcast (HD and SD). My only recent frame of reference was the SIM2 HT3000. They looked very similar, except that the Sharp seemed a little, well, sharper, a perception that I attribute to its superior optics. After tweaking, the Sharp certainly offered better measured performance. Its provides better color performance and higher contrast. In fact, the only area of measurable performance where the Sharp could improve upon is light output. The High Brightness mode is quite bright, but the black level is unacceptably elevated. The High Contrast mode offers great black level, but it is too dim for my taste. The Medium mode is just about right, but I’m concerned that after 500 hours I’ll be below 12 FtL on my unity gain screen. Edit: After reducing lens shift, this is no longer a problem. Now the Medium Iris setting is actually too bright in High Lamp mode, though this will obviously change as the bulb ages.

The biggest improvement of the 1080p pixel count is smoothness, depth, and a difficult-to-describe improvement in realism. The illusion that you are looking through a window viewing actual events is better conveyed with 2,073,600 pixels than it is with 921,600 of the little buggers. There’s clearly more picture information on the screen, which is evident even with standard DVD. However, I think that I was even more impressed by the Sharp’s core color and gamma performance. The CMS system works wonderfully and it really shows on the screen.

There is actually one downside to 1080p projection, at least when combined with a unit with optics as good as the Z20000. As audiophiles have long known, one of the unintended consequences of using a very high-end sound system is that it is ruthlessly revealing of the source material. That is also true with video. The Z20000 did a much better job of revealing differences in quality between a variety of HD broadcast sources, differences that were not as obvious with my Optoma H79. I saw all sorts of flaws in these images that I hadn’t noticed before. However, with clean sources, such as HD DVD, the results are startling.

Despite the advantages of 1080p, resolution is only one measurement of performance and arguably not even the most important one. If the Z20000 had not also provided exemplary colorimetry, optics, and contrast, then the 2 million pixels wouldn’t matter much. Furthermore, to the extent that it does matter you need a large screen to appreciate it. I wonder how much obvious benefit users can expect from 1920x1080 50 and 60” rear projection displays.

Other than the Optoma HD81, the Sharp is currently the only available 1080p DLP with a street price below 10k. I had originally wanted to go with the Optoma, but their bone-headed decision to market a projector with a 37% vertical offset with no lens shift dashed those plans. Jason has these units in stock and can quote you a very attractive price considerably south of 10k, so if you are in the mood to upgrade you should give him a call.

__________________
Tom Huffman
Rockville, MD

kostas kefalas
01-11-2006, 22:44
Δεν λενε τι λαμπα φοραει Τακη..?
Μαλλον 250αρα....

takisot
01-11-2006, 22:59
ακριβως....

Browser
02-11-2006, 08:33
Καλα, ειδικα απο το διαγραμμα ισοροπιας, με τετοια κλιμακα ανα 20% δεν καταλαβαινεις ........τιποτα!

ilias
02-11-2006, 09:58
Edit: Once I reduced the amount of lens shift from 21" to 6", both the light output and contrast were improved substantially. After making this adjustment to my installation, light output is no longer a major concern for me.

Επηρεάζει το lens shift τη φωτεινοτητα και το contrast? Κατα ποιο τρόπο?

kostas kefalas
02-11-2006, 11:44
Ειναι καλο το μηχανακι Χρηστο.....
Απο τα σχεδιαγραματα ισοροποιας και τριγωνου(απο μαμα)δειχνει οτι ειναι καλο....αν ειχε και λιγο καλυτερο κοκκινο και κιτρινο θα ηταν μια χαρααα.....!!!!!!!
Και το πρασινο καλο ειναι....μπορει να δειξει "σωστα" αρκετα;)

Browser
02-11-2006, 11:46
Ειναι καλο το μηχανακι Χρηστο.....
Απο τα σχεδιαγραματα ισοροποιας και τριγωνου(απο μαμα)δειχνει οτι ειναι καλο....αν ειχε και λιγο καλυτερο κοκκινο θα ηταν μια χαρα.
Και το πρασινο καλο ειναι....μπορει να δειξει "σωστα" αρκετα;)
Συμφωνω. Απλα οπως βλεπεις το εχει το πεπλακι του χαμηλα...και το gamma του ειναι.......καπως -bye-

Δεν του βγηκε του μαστορα στη ρυθμιση καλα, μιας και αποτι λεει δεν μπορουσε να αλλαξει τα οφφσετ των χρωματων......

Παντως αποτι θυμαμαι που τον ειχα δει, παιζει καλα !!!!

kostas kefalas
04-11-2006, 15:58
Τελικα φοραει λαμπα.....220W SHP Lampe
Πολυ καλο..;)οριακος προς το ιδανικο....
Θα ειναι καλος...