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TheVerge
Joined: 19 Jul 2009
Posts: 928
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| Posted: Wed Oct 20, 2010 2:04 pm Post subject: Anamorphic crt |
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Say you were really, really, really bored in the winter because i don't go outside when the temperature is below 50. Also, say you like gluing sh*t together and being very unproductive.
Has anybody been stupid enough to try building an anamorphic lens for their CRT(well, 3 of them actually) out of prisms? Seems like you could get a lot more brightness and vertical resolution with such a junkstrocity.
http://www.zuggsoft.com/theater/prism.htm
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Wed Oct 20, 2010 2:11 pm Post subject: |
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One finn build one big two prism set for his G70 years ago.
You need two prism to prevent chromatic aberration, one was water filled (30 deg) and second one was glycerine filled (24 deg).
Glycerine prism was dimming all that extra brightness that full raster was giving, so he never used it.
He was going to test silicone oil or something else for that second prism, but never find time for that.
Last edited by Ile on Thu Oct 21, 2010 6:23 am; edited 1 time in total
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Wed Oct 20, 2010 2:17 pm Post subject: |
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I played around with the idea, but after reading a bunch of stuff I came to the conclusion that building stuff that could resolve 1920x1080 at the optical level would be vastly difficult, thus negating the whole purpose.
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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: Wed Oct 20, 2010 2:41 pm Post subject: Re: Anamorphic crt |
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| TheVerge wrote: | | Seems like you could get a lot more brightness and vertical resolution with such a junkstrocity. |
Like Ile pointed out, reflections will burn most of the brightness gained in using more phosphor area, so brightness isn't much of an advantage. Like Perisoft pointed out, building something that size with decent optical properties would be a huge challenge.
The other problem is that the prism would have to be huge, along the lines of probably half-again as big as the front of the projector. You're talking a prism in the ballpark of 18 inches or so by nearly three feet. With that size material, it's going to cost a lot just to experiment!
The one cool thing is that unlike the digital guys, you could eliminate a lot of the chromatic aberration with convergence controls.
It's a cool idea many have had over the years, and if you want to try, knock yourself out... If nothing else, it will be fun for everybody to read the story and see the pics.  But, in the end, I think you'll have spent a good chunk of time and enough money to have bought another projector and not have gained much.
SC
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