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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Tue Jun 28, 2011 10:13 am Post subject: hd10 lens design? |
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The HD10 family of lenses has been designed to maximize performance and
versatility for professional CRT projection video, data and graphics applications.
All HD10 family lenses are optically coupled and designed to cover a full 178mm
(7”) raster diagonal.
this is from the pdf about the hd10 family lenses.
am i missing something here or is there simply no lens available that is designed for a larger then 7 inch diagonal of the tubeface, so focus abilty is always compromised when setting up a larger then 7 inch diagonal raster on a 9 inch tube?
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Tue Jun 28, 2011 11:38 am Post subject: |
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They are referring to real life picture size at tubes face, not to fantasy raster size at two inch outside tubes face plate that salesmans used. 
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Tue Jun 28, 2011 1:56 pm Post subject: |
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Reality Sucks!!!!!!!!!!!! 
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Jun 28, 2011 2:17 pm Post subject: Re: hd10 lens design? |
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| dvh99 wrote: | The HD10 family of lenses has been designed to maximize performance and
versatility for professional CRT projection video, data and graphics applications.
All HD10 family lenses are optically coupled and designed to cover a full 178mm
(7”) raster diagonal.
|
Closer to reality would be:
'we made these lenses because a bunch of engineers designed a high end CRT chassis, and came to us asking: 'holy sh*t, how do we project this image onto a really big screen?' 
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Gerbrand
Joined: 13 May 2008
Posts: 199
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| Posted: Tue Jun 28, 2011 3:08 pm Post subject: |
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| Quote: | | They are referring to real life picture size at tubes face, not to fantasy raster size at two inch outside tubes face plate that salesmans used |
For instance: my raster is about 14.5 cm wide. At 4:3 this would correspond to 7.15 inches, which is nowhere near the 9 inch marketing pitch.
Gerbrand
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Wed Jun 29, 2011 4:08 am Post subject: |
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| Ile wrote: | | They are referring to real life picture size at tubes face, not to fantasy raster size at two inch outside tubes face plate that salesmans used. |
i get it... 9 inch tubes do not exist
i am going to measure the diagonal myself btw as the liquid (demineralised water) that is now in the blue chamber is coming out  .
i cannot believe 7 inch is about the max you can get from a 9 inch tube.
that is a 5cm margin !.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Wed Jun 29, 2011 6:32 am Post subject: |
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| dvh99 wrote: |
i get it... 9 inch tubes do not exist
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Don't be silly; the twelve inch tubes likely measure around nine inches!
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Wed Jun 29, 2011 8:17 am Post subject: |
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I was always under the impression ALL tubes in ALL CRTs are measured to the edge of the glass? Every single 17 inch CRT monitor ive ever seen only had a 16 inch ( or sometimes even less!! ) viewable area!!
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Thu Jun 30, 2011 11:02 pm Post subject: |
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Does it really matter anyway. A 9" tube is larger than a 7" tube in terms of physical size, raster size and performance.
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Fri Jul 01, 2011 1:09 am Post subject: |
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the topic was that the hd10 lenses were designed to focus a diagonal up to 7 inches and i think it`s silly that a nine inch tube has only 7 inch of usable space if this is true, not about real tube size being important or not.
i know when the blue comes out and new fluid goes in and will certainly let you know the exact maximum usable diagonal.
almost certain it is more then 7 inches
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sat Jul 02, 2011 9:27 am Post subject: |
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ok, i measured and even with a 4:3 ratio the maximum available tube face diagonal is just a bit more then 7 inch.
this is disappointing for a 9 inch tube!
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Sun Jul 03, 2011 7:34 am Post subject: |
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| dvh99 wrote: | ok, i measured and even with a 4:3 ratio the maximum available tube face diagonal is just a bit more then 7 inch.
this is disappointing for a 9 inch tube! |
How disappointing is it if you have 7 inch tubes.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Sun Jul 03, 2011 7:37 am Post subject: |
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probably 2 inches more disappointing
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