Hi,

I finally got my Infocus 4805 yesterday, tried it out on my wall, I did not find it that impressive. I can see the Screen Door Effect(SDE). I have tried Infocus X1 before and 4805 is no better than X1, except that 4805 is native 16:9 projector. I thinking(or atleast hoping) that the SDE can be avoided with a screen.

My wall is kind of cream-ish color, I am going to try using a white screen.

Did anybody on this forum have had this kind of an issue?

Any input would help me and truly appreciated.

Thanks,
Naveen

[Messiah]

It might be 16:9 but it only has a resolution of 854x480 so you will need to sit further away from the screen than with a 1280x720 pj to minimise or eliminate the SDE.

IIRC the X1 was an 800x600 pj so in 16:9 mode it too had a horizointal resolution of 480 lines so I do not see why the SDE should be any different on one than the other.

[inzaman]

How far away are you from the screen, also what was being projected at the time i.e light grey colours etc.

I saw one last saturday and was about 1.5 width away and couldnt see any sd, i was very impressed with the unit but bearing in mind my current pj is lcd.
This was the first dlp that i didnt get any rainboe effect from or eye strain etc.

Hi Messiah,

there is no difference in SDE between X1 and 4805. do you think adding a screen(as of now, I am using a wall)would make a difference?

Thanks,

Hi Inzaman,

I was sitting at 13ft(156 in.) away from the wall and the width of the picture was 77in., so that is 2x. The tried these movies: MI(first one), Monsters, Harry Potter(first one), U-571. I must say when there are bright colors(red, blue or even human skin color) it is clear and perfect, even face closeups were really good, but during light colors or even text, I can see SDE, for example first scene in Harry portter(if you have seen it), when dumbledoor is collecting the light from street lights, I could clearly see pixels for the street lights and also the grey parts of the scene.

thanks,

[Gary Lightfoot]

Generaly, sitting 2x away from a DLP svga res pj should be enough for SDE to not be a factor, but it looks like you have good eyes for it..

Try a slight defocussing of the lens - this can be done without noticably effecting the image, so have a go at doing that and see what results you get.

I have heard people mention that changing from a white screen to a grey screen, and in some cases, a lower gain screen reduced the apparent screendoor, but that's a subjective evaluation based on already having a white screen. Higher gain screens can make it worse apparently.

Some people have had similar results using a lens filter (FL-Day for instance), and that's cheaper than buying a screen. The only other way is to make the image smaller or sit further back.

Gary.

[Messiah]

Many people see SDE with 1280x720 pjs so it does not surprise me that you may see it with a pj with only 480 horiz resolution.

"there is no difference in SDE between X1 and 4805" That's what I'm saying. Why should there be? They are the same resolution when watching 16:9 material. If you saw SDE on the X1 then I would be surprised if you did not see it on the 4805. The only other way, AFAIK, is to slightly defocus like many with LCD pjs do. I don't think different screen material will make any difference other than maybe a grey screen as this may mask the darker pixel (mirror) structure (the grid spacing between the mirrors) slightly.

[Messiah]

At least we're on the same wavelength Gary. How you keeping?

[Gary Lightfoot]

I'm fine thanks!

Looks like we posted at the same time more or less... Glad we didn't contradict each other!

How's things with you?

Gary.

Originally Posted by Messiah

It might be 16:9 but it only has a resolution of 854x480 so you will need to sit further away from the screen than with a 1280x720 pj to minimise or eliminate the SDE.

Not entirely true if the 1280x720 pj is an LCD like the Sanyo PLV-Z2. Over on avsforum.com someone compared the Z2 to the InFocus 4805 (858x480 resolution) and the SDE (screen door effect) was actually less noticeable on the 4805 than on the Z2. This is because the spacing between the pixels on an LCD panel is generally much greater than the spacing between the micromirrors on a DLP chip.

from: http://www.avsforum.com/avs-vb/showt...37#post3936437

SCREENPLAY 4805 VS THE STUDIO EXPERIENCE 2HD (SANYO Z2 CLONE)

Since so many people wanted to see these two head to head, we spent some extended time with the two pieces right after the 4805 solo presentation.

First, high definition. On brighter scenes, the 2HD clearly had more detail than the 4805, just like we experienced with the 4805 vs the HD DLP units. The 2HD did have quite a few more picture artifacts, however – vertical banding was pretty obvious on brighter scenes, and there was stairstepping and jagged edges on any smooth edged object that moved in a diagonal fashion across the screen (this was very obvious on the speedboat footage coming from the DVHS deck). In terms of contrast and smoothness, the 4805 was a clear winner – the image looked much more 3-D and had a pop that the 2HD lacked.

In defense of the 2HD – on HD material, the 2HD had a “hyper-sharp” quality that was appealing, sometimes even appearing sharper than the HD2 DLPs. I attribute this to the more visible pixel grid on the LCD projector, which gave everything a hard edge that some might find preferable to the smoother look of the DLP.

On DVD, both pieces looked fairly comparable on brightly lit scenes. We used SPIDERMAN for this comparison, as it has plenty of bright and dark scenes to evaluate. When we went to the scene where Peter Parker finds his uncle lying in the street after being shot by the carjacker, the 2HD looked much murkier than the 4805. In fact, this is where the most dramatic differences between the two projectors became clear. Everything on the 2HD in this sequence became a dark blueish grey murk, with very little definition between the background and foreground elements. The 4805, on the other hand, rendered the scene with far greater contrast and more vivid colors. As I mentioned before, the image was much more three dimensional looking on the 4805.

I have mentioned in previous posts that the Z2 and other LCD projectors do much better on this type of material with DVI than with component, so we took SPIDERMAN out of the Pioneer DVD player it was in and placed it into the Bravo D-2 (graciously lent to us by the previous day’s Bravo D-2 winner). With DVI, the 2HD looked considerably better, mostly in the area of sharpness. The foreground and background elements were now considerably more distinct, but still did not even approach the color and contrast performance of the 4805.

I would say that there was no one at the shootout who preferred the image of the 2HD to that of the 4805, except possibly for brightly lit HD material. If there was someone there who preferred the 2HD, it is likely that they might have been afraid to speak up, since there was such a large vocal group of LCD bashers in the front row. Still, I don’t think many of those present were necessarily DLP proponents until after they had seen the side by side comparisons.

One last note about “screen door” effect. As Brad pointed out, the term screen door is more applicable to LCD projectors, since even the higher resolution LCD projectors have the more pronounced pixel grid that gives you the “screen door effect.”. Lower resolution DLP projectors have less of a problem with visible pixel grid than they do with visible pixels, since the grid itself is considerably less visible. In comparing the 4805 with the 2HD, the visible pixels became invisible on the 4805 at about the same distance the pixel grid became invisible on the 2HD.

[Messiah]

Originally Posted by monopole

Not entirely true if the 1280x720 pj is an LCD like the Sanyo PLV-Z2.

But no one's comparing the 4805 with an LCD here and I never mentioned an LCD. The original query made comparison of the 4805 against the X1 and that is what I based my response/s on. DLP all the way