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VIVITEK QUMI LED 1280x800 - Page 71

post #2101 of 2165
I bet it's quieter too - unfortunately I think disconnecting the internal fan would set off a fault mode.
post #2102 of 2165
,I don't hear it as I have a 5.1 surround sound and I guess the speaker volume is beating it so I don't hear it unless my head is like 2 feet away from it. I am planning to hang it on a wall too but not use the tripod mount anymore and I read someone cracking the mount because the design mistake vivitek made, it should had been on the middle right.
post #2103 of 2165
That was me. The cracks are very slight and might have been caused by adjustments. Look back through this topic and you will see what I did about it.
post #2104 of 2165
Quote:
Originally Posted by crashbot View Post

That was me. The cracks are very slight and might have been caused by adjustments. Look back through this topic and you will see what I did about it.

I can see that, but placing a wood on top of it is not the best idea don't you think?  If you remember the guy that open his Qumi in a recent post, the top of the Qumi is where the entire copper plate is placed that is why the top housing is the one that is getting hot.

 

My problem is connecting my xfinity X1DVR box via HDMI to my Qumi's mini HDMI it looses signal back and forth every 5-10 sec continiously, I have no idea what is going on, I tried to use the same HDMI cable and connect my 55" tv from the X1 DVR and there is no lose connection problem, If anyone has the same issue please let me know.


Edited by KikiM - 11/9/13 at 2:04pm
post #2105 of 2165
Quote:
Originally Posted by KikiM View Post

I can see that, but placing a wood on top of it is not the best idea don't you think?  If you remember the guy that open his Qumi in a recent post, the top of the Qumi is where the entire copper plate is placed that is why the top housing is the one that is getting hot.
You could be right, but in normal use this particular Qumi runs in eco mode. No problems so far (IIRC it has an over-temp shut down), and the top plate lets me mount it the right way up but from an overhead screw.

Things are in flux - at the time I had no expectation of buying another and the arrangement was designed with adaptability in mind; now the Q2 will be fixed and Q5 more likely to move about (but much less frequently). For the Q5's normal service it will be hanging upside down, so it just needs a bottom adapter plate to relocate the thread mount to the CoG.

Go into a camera shop and try to buy a quick-release plate for particular tripod and you will pay £30 (if available at all) - why don't they standardise, different makes of tripod (and even different models) have different sizes of plate? However, on eBay I got a whole tripod (brand new) for £7 delivered, I wasn't expecting a great deal but actually it's amazing for the money: 3-section telescopic legs, rack and pinion height adjustment, pan tilt and yaw head with spirit level, and a quick release dovetail plate. My intention is to use it for parts and have a height adjustable ceiling mount for the Q5 that retracts into the void between the ceiling board and the floorboards above.

Re the fan: would the USB socket power a 5V fan instead of having to run a separate 12V adapter?
post #2106 of 2165
Quote:
Originally Posted by KikiM View Post

I don't know if this will prolong my Qumi Q2 but I did a diy cooler for it, now the top never gets warm at all, it is still cold to touch after I played BF4 for 4hrs+ and I can feel the vent beside the bulb is really sucking air, it even suck the white letter paper if I place one beside it. Please don't laugh I only made this with a USPS box duck tape from $1 store and an old fan from my old desktop and use a 12volts ac adaptor from my old wifi router thanks to comcast they gave us a modem with router on it. I did this on my old xbox 360 with the prone red ring of death defects and mine never experience the rrod so I decided to do it here on my Qumi thinking I am not gonna loose anything anyway. I only got the Qumi for $250 and some change so I need to do some safety precaution. As far as fan noise, I don't hear any of that I have 5.1 bose surround sound so even at minimum volume I don't really hear it.

Thanks for all the pics and information Kikim - great idea! And I wish I had your sound system biggrin.gif

Jim
post #2107 of 2165
Quote:
Originally Posted by JDAstro View Post

Quote:
Originally Posted by KikiM View Post

I don't know if this will prolong my Qumi Q2 but I did a diy cooler for it, now the top never gets warm at all, it is still cold to touch after I played BF4 for 4hrs+ and I can feel the vent beside the bulb is really sucking air, it even suck the white letter paper if I place one beside it. Please don't laugh I only made this with a USPS box duck tape from $1 store and an old fan from my old desktop and use a 12volts ac adaptor from my old wifi router thanks to comcast they gave us a modem with router on it. I did this on my old xbox 360 with the prone red ring of death defects and mine never experience the rrod so I decided to do it here on my Qumi thinking I am not gonna loose anything anyway. I only got the Qumi for $250 and some change so I need to do some safety precaution. As far as fan noise, I don't hear any of that I have 5.1 bose surround sound so even at minimum volume I don't really hear it.

Thanks for all the pics and information Kikim - great idea! And I wish I had your sound system biggrin.gif

Jim

You are welcome, I was looking for your reply and found it inside my post wink.gif jk
post #2108 of 2165
Quote:
Originally Posted by crashbot View Post


Re the fan: would the USB socket power a 5V fan instead of having to run a separate 12V adapter?

I have the Qumi Q2 lite so the usb on this model is only for service, if you got the normal Q2 (the one with a card slot), the usb will run a usb fan, but take note the usb fan does not run that fast compare to the 12v fan.

By the way I have a copy of the blueprint of the cooler made from photoshop that is printable on a letter paper, and made it a little bit slim and
I named it "Q2 Cooler Slim" smile.gif
I will upload it here and all you need to do is print it and trace cut it on a carton or empty box. But I have to convert it to jpeg format so for those who don't have photoshop can still print it.
post #2109 of 2165
Well now. I spotted some colour artefacts on the Q5 today (the contours you get when the area is of constant colour with subtle variation), and repeating the same playback on the Q2 didn't show the same effect. I shall examine this in detail, but it appears for the moment that the Q5 has a lower colour resolution than the Q2.

Edit: It's OK, I've sorted it. The display mode was set to "bright", it's fine when set to "TV".
Edited by crashbot - 11/22/13 at 11:09am
post #2110 of 2165
Sorry to hear about the artifacts on the Q5. I haven't noticed any artifacts yet on my Q2, but it might be my eyes aren't as sharp as others. The only complaint I have so far, forgiving the low lumens, is that the image on the Q2 just doesn't appear as sharp as I expected it to be - or am I expecting too much for 720p on a 60" screen? I was happier with the image on my Benq MP610, which has a resolution of 800x600, on a 80" screen. Could be though I am remembering more brightness as opposed to better resolution.
post #2111 of 2165
It's OK, I've sorted it. The display mode was set to "bright", it's fine when set to "TV".

I guess "bright" is meant for sources which do not output the full 0-255 range of values so that something greater than zero has to be interpreted as black and something less than 255 has to be interpreted as full brightness (R, G, or B).

What I am noticing now is a focus error - the "top" of the projected image (relative to the orientation of the Qumi) focuses further away that the bottom.
Edited by crashbot - 11/23/13 at 12:02am
post #2112 of 2165
I too noticed a drift in focus in some scenes of a recent movie which had a patchwork frame behind one of the actors. I re-focused the Q2 using the frozen image and did see a change in focus from top to bottom, but i attribute it to the screen not being perpendicular to the Q2 projection angle. My screen is not fixed to the wall, but sitting on two chairs and leaning against the wall at the upper edge. The wall has a window. and I did not want to block it entirely but as we never have it opened it wouldn't hurt to put in a couple of screws to hang the screen whenever we use it. That will flatten it against the wall. Next little project Should improve the focus in general.
post #2113 of 2165
This is definitely with perpendicular alignment. As it happens, this focus error is quite convenient - it is not too bad in the perpendicular, and cancelled out if I mount the Q5 higher and angle it down (with keystone correction).
post #2114 of 2165
I notice there is now a Q7, larger beast with 800 lumens.

Does anybody know what "auto keystone" is? The manual says nothing other than how to turn it on and off. All it does on my Q5 is change my -6 setting to -2. I could have a guess that there is some kind of inclinometer which allows the Qumi to calculate the optimum keystone setting assuming the projection surface is vertical, but if so it doesn't work.
post #2115 of 2165
My screen is not vertical as it is leaning against the wall and is supported by two chairs. It was the quickest mounting solution I had as there is a window behind the screen. So I have never used the auto-keystone feature. If I ever mount the Qumi2, which normally sits on the coffee table,- I may need the autokeystone function. Checking on the Q7 - could be worth while - as I am inclined toward a W1070 right now.
post #2116 of 2165
Quote:
Originally Posted by JDAstro View Post

I have never used the auto-keystone feature. If I ever mount the Qumi2, which normally sits on the coffee table,- I may need the autokeystone function.
Seems pointless to me.
post #2117 of 2165
Q7 at 800 lumens would help the 3D effect. But I am still not happy with the image quality of the Q2. The Q7 reviews do not say it's much better.
post #2118 of 2165
It's the same optics as far as I know, same resolution DLP anyway. I'm happy with my Q2 and Q5, but would start looking at what else is available for the price of a Q7.
post #2119 of 2165

I got a Q7 in October as my first PJ.

I compared it in a shop to the Q5: Q7 is definitely brighter.

To appreciate movies, *to my likings* and shooting to a white wall:

-  a screen with 230cm base needs an almost dark room (late night).

-  a screen with 150cm base is acceptable even in late afternoon (unobscured windows).

 

Usable for PC bright presentation: acceptable with a screen base of 150cm even in a room with halogen lights up to 300W ;-)

 

Optics.

Lenses are made of glass, not plastic. There is a small zoom (10%): in this is different from Q2/Q5.  There is no need to refocus after the unit warms (lukewarm, can touch it safely). There is some change in focus from top to bottom when aimed at a certain angle to the screen - of course, best is to keep it perpendicular.

 

Keystone correction.

Tried auto-keystone and then disabled it right after - I found it useless: Q7 has front adjustable feet (and a threaded hole in the bottom for use with a camera tripod: I use this solution) that allow for the same function to a finer extent.

 

Not really interested in 3D, just curious at the moment; maybe I'll get a couple of 3D glasses...who knows...

 

I'm not a pixel hunter and just like to watch movies in my small livingroom.

Yes, I have seen (and appreciated!) more expensive projectors ...but that was the budget.

Yes, I would have appreciated more if the Q7 was a real full hd, but:

- I wanted something light, small and without power bricks, to put away when not used (WAF!) and easy to carry with me on holiday or at friend's to watch soccer matches together.

- I didn' want to worry about lamps to get cold or aging and similar.

At the moment we are happy with it.

 

Regards from Rome. :-)

post #2120 of 2165
Sh*t. Wish I had waited and not bought a Q5. Still, it does what I want.
post #2121 of 2165

Yep! That's what I will say in, say, one year to one year and half, when a more performant Qumi (Q9/Q11/Q13...) will get to the market!

But we all do make choices and technology runs...

:-)

 

Regards from Rome!

post #2122 of 2165

Hi, I would like to hear from you, how good is the qumi q5 for desktop work?

I intend to used as my mac-mini monitor. To work with internet, emails, finder.

Are the letters and reading experience, good enough?

 

 

Yours, 

 

 

Fred

post #2123 of 2165
I wouldn't say so. The DLP gives a diamond shaped pixel pattern, which is fine for "analogue" images but doesn't map well for fine text.
post #2124 of 2165
Ok , is it unreadable, on just not perfect?

Is there any LED projector that has a diferent pixel tecnology, that could be good for text?

thanks in advance
post #2125 of 2165
I'll bung up a screen shot later. What you need is a projector which provides a 1:1 match with the pixels the computer video card thinks it's outputting. That doesn't have to be full HD (1920x1080) as long as the computer knows what it is supposed to output and the projector (or monitor or TV) takes the output and does nothing to interpolate the input pixels to the output pixels (turn off overscan!). The computer video drivers will already have used smoothing tricks to make a text font look OK at the output resolution, and any further messing about at the display end will ruin it.

To stick with the Qumi's diagonal matrix means choosing a much lower output resolution so that there is at least one display pixel at every point the computer thinks there should be one.
post #2126 of 2165

Hi, I understand that your desktop use would be within the domestic walls, not in a class/small conference room, instead of an LCD TV/monitor.

 

IMHO, I wouldn't use a qumi as a PC monitor because:

- its brightness is not at the top: unless keeping the screen size small (say <40", --> shooting very close to the screen), the room lighting heavily limits the conditions for its usage as pc monitor.

- basically the unit is noisy due to its cooling fan and if such noise is hardly perceivable while a movie is playing (even then I'd like it to be recessed in the false ceiling), overwhelmed by the sounds from the 5.1 channels, in a quieter environment may become disturbing.

- the shape of pixel grid does not return the best picture quality for such a use (see what crashbot says).

 

Maybe it's OK for occasional usage (there's an internal browser), but Internet surfing, mail/finder sessions in "everyday usage" may last for long time...

On the other hand, in a classroom/small conference room (with people and bigger than an average livingroom) noise gets lost, but brightness and picture quality at bigger screen sizes remain an issue.

 

I don't mean it's like staying in a sawmill, but when you switch it off, say,  after an hour, your ears really do appreciate it. Besides the mac mini is really a quiet one!

 

That's MY opinion. ;-)

 

 

Regards from Rome!

post #2127 of 2165
Well what do you know!

I connected my notebook up by HDMI (80" diagonal) and let it use the default 1280x800 resolution that gets selected by Plug'n'Play. I was actually very impressed, and retract what I said before.


Edited by crashbot - 12/14/13 at 2:57am
post #2128 of 2165
Quote:
Originally Posted by Stoney Jackson View Post

Just posted in the 3DFury topic, I Got my 3D Fury yesterday. Shipped from Taiwan Wednesday got it Thursday in NY. Incredibly fast service. Set it up and couldn't figure out what I was doing wrong. A quick post on their forum and had help within minutes! 3D is now working from my fat PS3 to my Qumi. I am very happy so far. Watched a bit of the IMAX Under the Sea disc and my wife and kids were amazed. This product really seems to work great with DLP 3D ready projectors. No flickering at all on mine. Even though the Qumi is rated terribly dim, the brightness isn't a problem in a dark room on my screen made of black out cloth.
I hear the IMAX discs are the best. I'll have to test a darker movie and see how it holds up. I guess I can always paint the screen to get more gain, but in a light controlled room, the 3D is great!


Hey Stoney wanted to see if you can help a fellow New Yorker out from LI. I was debating on getting a acer k330 and a qumi q5 and now that it is confirmed the 3d works on the qumi I plan on getting the qumi. What setup do I need to hook my ps3 up to the qumi for 3d playback. I understand you got the 3d fury but which one do I need. How is it working for you today is there any other converter that you know works thanks for your help in advance

post #2129 of 2165

anyone here use the battery for the qumi q5 its one of my main reasons for choosing the qumi. I know the performance isn't gonna be nearly as good as when plugged in but if its watchable that's all that matters. Thanks in advance

post #2130 of 2165
As far as I know the performance is the same.
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