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Defocusing TH-AE100. Clockwise-Counterclockwise

909 Views 12 Replies 9 Participants Last post by  Alan Gouger
I get different results by turning the focus wheel clockwise vs counter-clockwise. What is your preference ?


One of the reasons why I'm asking is that lately I found myself playing more and more with defocusing. Reason being I've been noticing more amount of screendoor while watching directTV via dScaler on the AE100. It seems that no matter how much defocusing I apply the screendoor is still visible. My impression is that it didn't happen at the beginning.

Anybody having the same experience ?
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I prefer clockwise.
Clockwise facing the projector? :cool:
Hi,


Clockwise or counter-clockwise are the SAME. One way the focus comes in from top to buttom. The other way it's from buttom to top. If one de-focus slightly, the top will be sharper than the buttom or it's the other way. In short I can't get a evenly slightly de-focused picture unless I de-focus it all the way so the un-even in-focus doesn't matter anymore...


regards,


Li On
To me the pixel structure that appears on the screen seems different in two cases . It makes sense because in one case the focus lands in front of the screen rather than behind it.
There are also, extremely minor differences in defocussed pixel structure if I defocus my DILA in front or behind the screen plane (clockwise vs counterclockwise, motorized).


Although I don't defocus my DILA, I've got to play fine-tuning tricks with the focussing because there is a very minor focus nonuniformity issue with my G1000 (where the center is very sharp, but the top and the bottom is very slightly defocussed if I come up close. Not noticeable at regular viewing distance)
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Originally posted by audiovideodude
...Reason being I've been noticing more amount of screendoor while watching directTV via dScaler on the AE100. It seems that no matter how much defocusing I apply the screendoor is still visible. My impression is that it didn't happen at the beginning....
Are you sure you are not seeing DTV's pixelation instead of a screen door? I can see a lot of artifacs or pixelation on DTV, specially on their highly compressed locals channels. This in on a 52" rear projection TV. I know there is no screen door on rear projection TVs, but maybe the image imperfections that I see on my TV look like a screen door on your AE100. How about other video sources, are they as bad?
Last night I watched "Enemy at the Gate" and I might have seen screendoor only a couple of times on panning scenes, one when the "Mouth-of-stell" guy gets shot which really makes me wonder about directTV effect on apparently looking-like screendoor artifacts.


But then it really looks like screendoor to me. I'm a bit a lost here.
I have one question:


1) Do you see a grid? An artifact of lines intersecting at 90 degrees? Or do you see some vertical OR horizontal lines but not both v and h or do you see some banding?


Usually when you see screen door, it is a grid with vertical and horizontal lines equally visible.
I believe it a a grip. That way I callled screendoor. I'm going to check it again today and let you know and maybe take a couple of pictures if time permits.


I'm starting to think that screendoor perception might be releated to either the source quality or settings. One more clue is that I just realise that this problem starter after a autocalibration of dScaler using Optimode.


Hummm...
Does is matter if you are in the northern or southern hemisphere? ;)


--Burke
Quote:


Clockwise or counter-clockwise are the SAME. One way the focus comes in from top to buttom. The other way it's from buttom to top. If one de-focus slightly, the top will be sharper than the buttom or it's the other way. In short I can't get a evenly slightly de-focused picture unless I de-focus it all the way so the un-even in-focus doesn't matter anymore...
Sounds like you will need to implement scheimpflug adjustment. LOL.
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