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Eidophor Projection - CRT was yesterday!

 
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nidi



Joined: 17 Aug 2008
Posts: 182
Location: Switzerland


PostLink    Posted: Sat Apr 13, 2019 4:45 pm    Post subject: Eidophor Projection - CRT was yesterday! Reply with quote


        Register to remove this ad. It's free!
just found this commercial for Eidophor:

http://datenbanksammlungen.mfk.ch/eMP/eMuseumPlus?service=ExternalInterface&module=collection&objectId=169555&viewType=detailView


download the 146305 file, give it a .mp4 tag and play it.


https://en.wikipedia.org/wiki/Eidophor

Spectacular Swiss Technology !


Last edited by nidi on Sat Apr 13, 2019 5:00 pm; edited 1 time in total
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nidi



Joined: 17 Aug 2008
Posts: 182
Location: Switzerland


PostLink    Posted: Sat Apr 13, 2019 4:48 pm    Post subject: more info Reply with quote

how this technology worked, more info:


https://www.youtube.com/watch?v=3-BvMcqEc98
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Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 23663
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Sat Apr 13, 2019 7:11 pm    Post subject: Reply with quote

I saw the Eidophor in the 11th row of the Michael Jackson Victory tour in 1986. Best and largest video picture I ever saw.
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Tim in Phoenix



Joined: 21 Oct 2006
Posts: 4202
Location: Phoenix


PostLink    Posted: Sun Apr 14, 2019 3:14 pm    Post subject: Reply with quote

Yup

https://en.wikipedia.org/wiki/Eidophor

I'll bet the lenses were $15K...........each. The chassis looks very well made, aerospace grade.



Mike Harrison.......his website has ALL my favorite stuff on it.

http://www.electricstuff.co.uk
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HaydnG90



Joined: 22 May 2006
Posts: 1050



PostLink    Posted: Sun Apr 14, 2019 6:48 pm    Post subject: Reply with quote

An oil vacuum pump. The lumen output must be off the charts. If I had that in my HT it'd probably melt the screen.
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garyfritz



Joined: 08 Apr 2006
Posts: 10582
Location: Fort Collins, CO


PostLink    Posted: Mon Apr 15, 2019 12:17 am    Post subject: Reply with quote

The docs claim the Eidophor was 80x brighter than CRTs of the day. Other docs claim 10,000 lumens, and I assume that would be ANSI lumens -- I doubt it was current-limited like CRTs are. A 9500LC puts out about 260 ANSI lumens, so 10,000 / 260 = 38x; a G90 at 60Hz is rated 280 lumens, 10000/280 = 35.7. So the Eidophor had roughly 35-40x the lumens of the best CRTs.

They claimed screens up to 18 metres = 59' in width. Assuming a 4x3 aspect ratio, that's 59 * 59/1.33 = 2611 sq ft -- call it 2500 sq ft. So that enormous screen would only have 10000 / 2500 = 4 ft-candles -- unwatchably dim in my opinion. Cut the screen size in half (9 metres = 30' wide) and you'd have a nice bright 16 ftC image. It could probably do an acceptable image 35 or even 40' wide.

Your HT screen is probably about 7-8' wide. Mine is 7.1' x 4', which is 28.4 sq ft. But the Eidophor probably had a 4x3 panel image, and my screen wouldn't use all of the height. A 16x9 screen would only use 9/12 = 75% of the 4x3 = 16x12 panel image. So it would only see 75% of the 10,000 lumens, or 7500 lumens. Which would be really bright, but your screen shouldn't catch fire. 7500 lumens is "only" 5.8x more than the 1300 ANSI lumens put out by my RS-45. My ftC calculations aren't working right -- I'm getting crazy-high ftC for both my RS-45 and the Eidophor -- but it should be about 5.8x brighter than my RS-45, or about 90-100 ftC. I think you could almost watch that in full sun. Smile
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zaphod



Joined: 16 Jun 2006
Posts: 2002
Location: Cloverdale


PostLink    Posted: Mon Apr 15, 2019 7:16 pm    Post subject: Reply with quote

and I bet Jeremy has two stashed away in the back room...
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AnalogRocks
Forum Moderator


Joined: 08 Mar 2006
Posts: 25418
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Tue Apr 16, 2019 4:38 am    Post subject: Reply with quote

zaphod wrote:
and I bet Jeremy has two stashed away in the back room...


I had a series of posts about these some years back. Unfortunately I do not have any BUT I did find a pair of lenses at thrift that look like the ones for the Eidophor.

Still looking for a pair of Eidophors. Wink

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garyfritz



Joined: 08 Apr 2006
Posts: 10582
Location: Fort Collins, CO


PostLink    Posted: Tue Apr 16, 2019 5:15 am    Post subject: Reply with quote

AnalogRocks wrote:
Still looking for a pair of Eidophors. Wink

Gonna set up a steampunk 3D rig?? Laughing
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Tim in Phoenix



Joined: 21 Oct 2006
Posts: 4202
Location: Phoenix


PostLink    Posted: Tue Apr 16, 2019 3:36 pm    Post subject: Reply with quote

garyfritz wrote:
AnalogRocks wrote:
Still looking for a pair of Eidophors. Wink

Gonna set up a steampunk 3D rig?? Laughing



Edge blend. Watch it outside. Daytime! LOL
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 25418
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Wed Apr 17, 2019 3:18 am    Post subject: Reply with quote

Tim in Phoenix wrote:
garyfritz wrote:
AnalogRocks wrote:
Still looking for a pair of Eidophors. Wink

Gonna set up a steampunk 3D rig?? Laughing



Edge blend. Watch it outside. Daytime! LOL


Hmmmm.....movies for a sunny afternoon

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Tinman



Joined: 09 Mar 2006
Posts: 1326
Location: Los Angeles, Ca.


PostLink    Posted: Sun Apr 21, 2019 8:18 pm    Post subject: Reply with quote

I had an Eidophor projector for a while.
The problem with it was it's (for a house) enormous power consumption. And at 240V no less.

It was interesting, and very large.

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AnalogRocks
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Joined: 08 Mar 2006
Posts: 25418
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Sun Apr 21, 2019 8:45 pm    Post subject: Reply with quote

What signal did you feed into it ?
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tschaeikaei



Joined: 08 Apr 2013
Posts: 470
Location: Germany/Saarland


PostLink    Posted: Fri May 03, 2019 11:32 pm    Post subject: Reply with quote

I had some email conversation with a guy in Berlin who used to be one of the last techs that worked with Eidophor projectors
and saved two from scrapping.
The main thing with these projectors is that they don't do anything beyond 800x600.
There were "HD- mods" (by the factory) on one of the last models, but i think they were about XGA resolution.
So: no 1080p/i here.
It should be possible to experiment with different oil mixtures, temperatures and so on, but that's far beyond
of what i would try in me apartment. If anyone is interested, here is his website.
German language only, ask me if google can't translate Smile

https://eidophorblog.wordpress.com/

Regards, Julian

A word about mikes electric stuff: There are some mistakes in his TED talk about Eidophor, i assume because he didn't find enough material.

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Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 23663
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Sat May 04, 2019 2:34 pm    Post subject: Reply with quote

I've still got a GE Talaria here. 240 volts, in a road case. WOuld sell it cheaply if someone wants it. Have a bunch of spare bulbs for it, too.
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tschaeikaei



Joined: 08 Apr 2013
Posts: 470
Location: Germany/Saarland


PostLink    Posted: Sat May 04, 2019 2:54 pm    Post subject: Reply with quote

Curt: Do you have some screenshots and specs?
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Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 23663
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Sat May 04, 2019 9:00 pm    Post subject: Reply with quote

I don't sorry, it's buried.
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