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pascal ht
Joined: 24 Feb 2009
Posts: 6
Location: Kalmthout, Belgium
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| Posted: Wed Feb 25, 2009 1:43 pm Post subject: curved screen -- lenses -- marquee |
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Hello,
Who has experience with curved screens?
Does anyone know how curved a curved screen can be?
I have a 8500LC with HD10-GT17 lenses.
I have also a set of HD10 lenses and a set of HD10L lenses. The screen is too big for HD10L.
Electrohome advises to use a curved screen, so I did.
The screen is a Stewart screen, it is part of a cylinder, not a sphere :
screen arc length=8ft (2,44m)
Chord length =7ft 11" (2,42m)
depth of curve, segment rise of 5.75" (14,6cm)
I find it difficult to focus in the corners, in fact the adjustment for the outer edge, on the lenses, are at the end of the setting.
Does anyone know how curved the screen can be, given a lens?
Pascal
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Chuchuf
Joined: 11 Mar 2006
Posts: 548
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| Posted: Wed Feb 25, 2009 3:01 pm Post subject: |
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The HD10 GT17 lens's are not really for a curved screen. Nor are the HD10's or HD10L's. So they will suffer from out of focus corners and sides on a curved screen.
Terry
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pascal ht
Joined: 24 Feb 2009
Posts: 6
Location: Kalmthout, Belgium
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| Posted: Wed Feb 25, 2009 4:01 pm Post subject: |
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Hello Terry,
Would you advise me to change the frame of the screen and make it a flat screen?
Pascal
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nuttall_chris
Joined: 08 Mar 2006
Posts: 832
Location: Ottawa, Ontario, Canada
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| Posted: Wed Feb 25, 2009 4:08 pm Post subject: |
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I used GT17 lenses when I had my 8500LC and I was able to get clear scan lines corner to corner on a flat screen.
Chris.
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nomadII
Joined: 16 Jun 2006
Posts: 252
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| Posted: Wed Feb 25, 2009 10:40 pm Post subject: |
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Terry may have a set of mine for curved screens that I would like to sell.
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pascal ht
Joined: 24 Feb 2009
Posts: 6
Location: Kalmthout, Belgium
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| Posted: Thu Feb 26, 2009 9:11 am Post subject: |
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Hello nomadII,
Do you mean a set of lenses specially adapted for a curved screen?
What type of lenses would that be.
I know that there exist lenses for a planetarium, but it seems to me that they are for screens that are more curved than mine.
Pascal
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