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mutantaction
Joined: 06 Sep 2012
Posts: 24
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| Posted: Tue Sep 25, 2012 8:09 pm Post subject: Bad flaring on blue tube? (Marquee) |
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Hi again!
While working on my Marquee, I noticed that my blue tube has VERY bad flaring at the sides of the
picture...seems like way beyond what lensflapping can correct(and that shouldn't fix both sides I take it)
What could cause this? No use trying to adjust the lenses. Doesn't get sharp at all.
Thanks!
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Sep 25, 2012 8:28 pm Post subject: |
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Scheimpflug (or lack of Schempflug correction to be more accurate) can absolutely cause poor focus on both sides; that is, in fact exactly what it is to correct for.
When a tube/lens isn't parallel to the screen, the projected plane of focus will also not be parallel to the screen. The net effect is that if the center is in focus, the two opposing edges will be nearly equally out of focus. To be more specific, the image will be in focus in front of the screen on one side, and behind the screen surface on the other side. Scheimpflug (flapping) rotates the plane of focus back into parallel with the screen.
Does the softness get progressively worse from screen center to edge? That's probably optical.
SC
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Sep 25, 2012 10:40 pm Post subject: |
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First off, look into the lens. If the tube face is out of focus, you've got electronic issues. THis could be:
Bad focus board
Bad astig output board
Bad CLM daughter board
bad CLM main board
If the tube face is in focus, then this is purely a mechanical/optical issue.
Narrow it down to which one it is first, and we can be of more assistance.
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Sat Sep 29, 2012 5:45 pm Post subject: |
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You may also just need to improve your astig and focus in the SM.
craigr
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mutantaction
Joined: 06 Sep 2012
Posts: 24
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| Posted: Fri Oct 05, 2012 3:05 pm Post subject: |
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Hi!
The flaring is on the tube face itself....what would be the next course of action?
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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mutantaction
Joined: 06 Sep 2012
Posts: 24
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| Posted: Sat Oct 06, 2012 9:57 am Post subject: |
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Oh man, been many years since I messed with that *sigh*
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