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noos@xp37+
Joined: 17 Jun 2008
Posts: 464
Location: Berlin/Munich
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Tue May 22, 2012 5:02 pm Post subject: |
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Ask the seller what it says on the label and why do you care ? 
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zGman
Joined: 22 May 2006
Posts: 599
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| Posted: Tue May 22, 2012 7:38 pm Post subject: |
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Noos likes lenses - he has been testing them for curved screens etc...
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Tue May 22, 2012 7:47 pm Post subject: |
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Looks ancient.
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Wed May 23, 2012 12:12 am Post subject: |
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The long lenses like that might be for long throw distance. They weren't very popular because of the loss of light output.
Scott
_________________
"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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noos@xp37+
Joined: 17 Jun 2008
Posts: 464
Location: Berlin/Munich
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| Posted: Wed May 23, 2012 7:01 am Post subject: |
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Yes, I just enjoy the big amount of lenses available for CRTs. I also guessed they might be long throw because of their size, and I do like shorter throws too. I saw the difference on the same screen in light output with a 8" LC machine, using lenses throwing 1:1 (HD117-12); 1:1,2 (HD215); and then 1:1,8 (HD10 on 8").
That these lenses on Ebay are ancient is the info I was looking for, because they are then not worse the hassle. Probably someone knows the generation of CRT projectors they were used for, then I know how ancient....
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donaldk
Joined: 17 Jun 2008
Posts: 308
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| Posted: Tue May 29, 2012 3:45 pm Post subject: |
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Delta II was good old 7" CRT like the Barco 600. Glass was considered an upgrade.
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