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holdenkicks
Joined: 29 May 2011
Posts: 56
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| Posted: Thu Oct 13, 2011 1:17 am Post subject: Ho can I achieve better focus on Barco Gfx 808s? |
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Hi guys
have done the lens focus adjustments, scheimpflug adjustments and electronic focus adjustments, but Im not exactly stoked with the focus Ive got. Its acceptable but I feel there's room for improvements. Is there anything I've missed? Any other way to get better focus?
Also, whats the recommended procedure for scheimpflug adjustments with regards to the front lens focus adjustment that focuses the corners?
I guess I could try cleaning the lenses but they look like they have minimal dust and im not sure which bolts i have to undo to remove them, and am worried i might screw it up!
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Barco Graphics 808s, ceiling mounted front projection,
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Thu Oct 13, 2011 1:57 am Post subject: Re: Ho can I achieve better focus on Barco Gfx 808s? |
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| holdenkicks wrote: | Hi guys
have done the lens focus adjustments, scheimpflug adjustments and electronic focus adjustments, but Im not exactly stoked with the focus Ive got. Its acceptable but I feel there's room for improvements. Is there anything I've missed? Any other way to get better focus?
Also, whats the recommended procedure for scheimpflug adjustments with regards to the front lens focus adjustment that focuses the corners?
I guess I could try cleaning the lenses but they look like they have minimal dust and im not sure which bolts i have to undo to remove them, and am worried i might screw it up! |
I am not sure how anyone would be able to tell you if you have optimal focus without some images. Even then it may be difficult. Be very careful if you want to clean the lenses as you can do more harm than good. I believe there is a procedure or two on this site for cleaning lenses you should read those.
You do have to have the mechanical focus right though so if your unsure that you have completed that correctly then you are probably right and it can be improved.
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zGman
Joined: 22 May 2006
Posts: 599
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| Posted: Thu Oct 13, 2011 3:52 am Post subject: |
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cpc magnetics must be right for optimal focus, then outer astig zones.
takes a while to get the hang of it, but very important...
G
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Oct 13, 2011 7:13 am Post subject: |
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Focus yoke placement along tubes neck and astig magnets could have effect to electrical focus.
Here's full procedure for tubes adjustment at two last pages. Use your main resolution during adjustment.
Before you mess up probably good astig adjustments, it's good to make fast check by projecting cross hatch and adjust midpoint focus from 0 to 100 and see if cross hatch moves to some direction. If it's stable don't mess with magnets. 
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noos@xp37+
Joined: 17 Jun 2008
Posts: 464
Location: Berlin/Munich
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| Posted: Sun Oct 16, 2011 6:18 pm Post subject: |
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Very good PDF! What else do you store on your harddisc?!
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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