2.35 Constant Height Faq - Page 4 - AVS Forum
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post #91 of 636 Old 02-03-2006, 09:44 AM
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WOW interesting...and confusing thread. It is actually making me consider 2.35:1 for my dedicated theater.

I have a Sharp 10000 can I get an anamorphic lense for it?

Almost all of my DVDs are Anamorphic, do I still need the lense.

Sorry if these questions are very basic for this thread.

Dave
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post #92 of 636 Old 02-03-2006, 03:21 PM - Thread Starter
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You still need the lens because the projector is native 16x9 (1.78) and you want to turn it into a 2.35 projector by adding the lens.

You should be looking at whether your dvd's are 1.78 or 2.35 aspect ratio not so much whether they are anamorphic or not.
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post #93 of 636 Old 02-17-2006, 09:19 AM
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I'm having the darndest time getting my retail 2.35 dvds to work on my 2.35 screen. I have the following:

Panny AE900U
2.35 Screen
UH-50 lens
Iodata Avel Link player 2.

Basically the problem is that i can not get my dvd player to stretch the 2.35 material vertically, thereby entirely removing the black bars before it gets to my projector. Is this how everyone else is doing it?

It seems like this needs to happen for it'll work? Please definately correct me if i'm wrong.
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post #94 of 636 Old 02-17-2006, 03:18 PM - Thread Starter
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See if you can stretch it on the projector.
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post #95 of 636 Old 02-23-2006, 06:50 PM
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Hi,

my name is samy and I'm french (sorry for my english )
I Have created 2 topics on a french forum about 2.35 pojection and DIY anamorphic lens.

DIY LENS :
http://www.homecinema-fr.com/forum/....php?t=29803723

2.35 PROJECTION :
http://www.homecinema-fr.com/forum/....php?t=29801701

We create a group command for prisms in BK7, all specifications are on the forum. If you want to post in english, no pbl.

sam
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post #96 of 636 Old 02-23-2006, 07:24 PM
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DIY ANAMORPHIC LENS OF GLUBUX, A FRIEND

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post #97 of 636 Old 02-23-2006, 07:25 PM
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post #98 of 636 Old 02-23-2006, 07:25 PM
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post #99 of 636 Old 02-23-2006, 07:26 PM
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post #100 of 636 Old 02-23-2006, 09:38 PM
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Quote:
Originally Posted by Jizzay1 View Post

I'm having the darndest time getting my retail 2.35 dvds to work on my 2.35 screen. I have the following:

Panny AE900U
2.35 Screen
UH-50 lens
Iodata Avel Link player 2.

Basically the problem is that i can not get my dvd player to stretch the 2.35 material vertically, thereby entirely removing the black bars before it gets to my projector. Is this how everyone else is doing it?

It seems like this needs to happen for it'll work? Please definately correct me if i'm wrong.

Jizzay are you connected with YPbPr or HDMI? (This might not work over digital).
1. Ensure the DVD player is set to 16:9.
2. Select the right input for your source.
3. Select the right AR using the remote. You should have different modes to choose from including 4 x 3, ZOOM and 16:9. You need the ZOOM mode which is a 4 x 3 mode that fills the entire width of the panel. The image should look like this.

Then with the lens in place, the image should look like this.

And you should have a 2.35:1 image...

Mark

Mark Techer

I love my Constant Image Height system!
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post #101 of 636 Old 02-23-2006, 09:46 PM
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skhattane,

Very cool DIY lens! Very neat work.
Here are my original prisms...



Mark

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post #102 of 636 Old 02-24-2006, 05:04 AM
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Hi mark,

Your prisms are very great look.
The specifications of our prisms :



Here my sample :



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post #103 of 636 Old 02-24-2006, 05:05 AM
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Here the result in projection :





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post #104 of 636 Old 02-24-2006, 05:12 AM
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The prisms are in glass of 2mm (no antireflection, it's just a sample).
The liquid is "glycérine" (I don't know the word in english). Refraction index : 1.473

The futur sample will be in BK7 (optical material) with antireflection coating, etc...
All specifications and lot of screen of many realisation are on hcfr (the french forum). Lot of informations. No pbl to post in english on the french forum

sam
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post #105 of 636 Old 02-24-2006, 05:29 AM
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Very cool! We call it "Glycerine" as well, but these are the first screen shots I've seen using it...
I've since built a 4 prism lens. Have you tried that yet?

Mark

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post #106 of 636 Old 02-24-2006, 08:47 AM
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Quote:
Originally Posted by CAVX View Post

I've since built a 4 prism lens. Have you tried that yet?
Mark

No, have you better results ?
Less chromatic diffractions or better geometry ?
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post #107 of 636 Old 02-24-2006, 08:54 AM
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those pictures of inaction scemes look great!
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post #108 of 636 Old 02-24-2006, 07:19 PM
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Quote:
Originally Posted by skhattane View Post

No, have you better results ?
Less chromatic diffractions or better geometry ?

I noticed less Chromatic Aberration and by reversing the prisms so that the hypotenuses of the right angled triangle (when viewed in plan) is out, better geometry...

Mark

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post #109 of 636 Old 03-03-2006, 10:19 PM
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QUESTION FOR THE BOARD- I'm having a little difficulty understinding something. An anamorphic lens allows you to use the full resolution of the display (mine is a 720P panasonic AE900 LCD) for 2.35:1 movies (okay, got it more projector pixels being used and no black bars on top and bottom). But the DVD player still is only outputting the usable 2.35:1 image using only 70% of the 480 horizontal lines possible. The black bars generated by the DVD player use up some of the resolution and can be removed by the display using aspect ratio to scale to use all 720 lines of the projector, but there is no way to get all 480 lines off the DVD in a 2/35:1 movie. Correct? Or am I missing something. I've toggled through all the output modes of my DVD player and they all put black bars on 2/35 images. help me understand where tthe increased resolution comes from - seems more like apparent resolution than true resolution benefit. -RANDOMCREEK
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post #110 of 636 Old 03-03-2006, 10:37 PM
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JIZZY1- What i'm saying is that I don't think you can remove those black bars via the DVD player. With the AE900 all you need to do is use aspect ratio button on the remote (second button up from the bottom left). This will allow the anomorphic lens to stretch the picture to 2.35:1. My issue is, however, that if you do this all you acheive is using more of the LCD panel (i.e all 720 pixels). Your not getting full 480 lines of DVD output- still only 400 (or something like that). I thought the point was to get the DVD player to output 480 horizontal lines of i2.35:1 mage (albeit squished to 16x9 aspect), then the projector to use all it's pixels in 16x9 mode (image still squished) and then anamorphic lens corrects the aspect and you'd end up with a higher resolution image on the screen. But I now am not so sure it works like that. The benefit is more display lines- not more image lines. Like having a TV with smaller pitch- this may provide more apparent resolution and reduce screen door effect, but no change in true resolution. The Panny already has smooth screen and i can sit 2 feet away from it and watch it without any screen door. IF there is a way to get greater true resolution I'm in, but can someone explain to us new to this how it's done- I'm not sure i understand.
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post #111 of 636 Old 03-03-2006, 11:45 PM
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It just became clear to me now that HD-DVD/BlueRay are noit being designd with the hometheater enthusiast in mind- at least not us front projection guys. All that disc space and the 2.35:1 cinemascope movies are still going to have black bars on top and bottom that you cna't get rid of and even using an anamorphic lens these epic movies will still have less true resolution than 16x9 throw away specials and made for TV movies and sitcoms. Great. I can understand why the DVD format did not consider this an issue worthy of consideration as most of us (none of us probably) were big screen junkies at the time DVD evolved, but why HD-DVD and BlueRAy specs do not have ability to output full resolution (720/1080i) for 2.35:1 cinemascope (in a squished format so anamorphic lens could be used in front projection with anamorphic lens) to get maximum resolution (and constand height functionality, full use of display resolution, etc) is just plain wrong. The most resolution is needed for front projection home theater and cinemascope aspect. It will be the same problem all over again-granted the overalll detail will be better than DVD but again the epic movies we like to watch the most and project bigger will be less detailed than 16x9 formatted junk. I'm probalby preaching to the choir here, but I has this issue ever been brought up as an issue to the HD consortiums? It's just like the highways they build here in Pennsylvania - every one has a bottleneck desigend in- engineered obsolescence. great.
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post #112 of 636 Old 03-04-2006, 02:38 AM
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2.35:1 CIH is about one thing - recreating the way it was meant to be seen. You can crunch rez numbers all day if you like. In the end, we have true widescreen images regardless of how much rez we have available to us to make them, our ARs are correct an the bigger AR is bigger...

We can only hope that these new generation formats do indeed offer that extra bit for cinema scope presentation...

Mark

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I love my Constant Image Height system!
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post #113 of 636 Old 03-05-2006, 02:56 PM
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Quote:
Originally Posted by Randomcreek View Post

It just became clear to me now that HD-DVD/BlueRay are noit being designd with the hometheater enthusiast in mind- at least not us front projection guys. All that disc space and the 2.35:1 cinemascope movies are still going to have black bars on top and bottom that you cna't get rid of and even using an anamorphic lens these epic movies will still have less true resolution than 16x9 throw away specials and made for TV movies and sitcoms. Great. I can understand why the DVD format did not consider this an issue worthy of consideration as most of us (none of us probably) were big screen junkies at the time DVD evolved, but why HD-DVD and BlueRAy specs do not have ability to output full resolution (720/1080i) for 2.35:1 cinemascope (in a squished format so anamorphic lens could be used in front projection with anamorphic lens) to get maximum resolution (and constand height functionality, full use of display resolution, etc) is just plain wrong. The most resolution is needed for front projection home theater and cinemascope aspect. It will be the same problem all over again-granted the overalll detail will be better than DVD but again the epic movies we like to watch the most and project bigger will be less detailed than 16x9 formatted junk. I'm probalby preaching to the choir here, but I has this issue ever been brought up as an issue to the HD consortiums? It's just like the highways they build here in Pennsylvania - every one has a bottleneck desigend in- engineered obsolescence. great.

No anamorphic Blu Ray / HD DVD 2.35:1 movies? What a disappointment..

If this is true I see no point in optomizing my HT for cinemascope movies . Since the best res will be 16:9 why not go with a 16:9 screen.
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post #114 of 636 Old 03-05-2006, 03:00 PM
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You guys were right, but it's annoying. I have to set my dvd player to 480p before i get the vertical stretch option on the projector. but it works great!
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post #115 of 636 Old 03-05-2006, 08:19 PM - Thread Starter
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Quote:


No anamorphic Blu Ray / HD DVD 2.35:1 movies? What a disappointment..

If this is true I see no point in optomizing my HT for cinemascope movies . Since the best res will be 16:9 why not go with a 16:9 screen.

Because it's not just about resolution. It's about the extra width you get with a 2.35 screen. As it's been said, it's the difference between it looking like a giant tv and like a cinema.

Plus, you can get full resolution for 16x9 movies by removing the lens or using passthrough mode on the prismasonics.

Trust me, once you've seen a Constant Height setup for movies you wont go back.
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post #116 of 636 Old 03-06-2006, 09:37 AM
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Quote:
Originally Posted by Tukkis View Post

Trust me, once you've seen a Constant Height setup for movies you wont go back.

Too true

Mark

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post #117 of 636 Old 03-06-2006, 12:26 PM
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My 1st CH theater experience will most likely be Mr. Poindexter's when he gets it finished in a couple months. Of course after that I'll be ruined for anything less and will probably be shopping for a new house to put it in my new CH HT. Oh well....
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post #118 of 636 Old 03-06-2006, 12:43 PM
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Quote:


Because it's not just about resolution. It's about the extra width you get with a 2.35 screen. As it's been said, it's the difference between it looking like a giant tv and like a cinema.

Yeah, I don't think many have one specific reason they're into CH, and certainly not "extra resolution". I haven't had my lens in place in quite a while, since my AE900 doesn't do the right scaling, so "added resolution" or "full use of the projector's panel" currently have nothing to do with why I bother. The aesthetic impact of it makes all the difference.

Jack Gilvey
SVS Customer Service

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post #119 of 636 Old 03-07-2006, 04:50 AM
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Jack,

the lack of scaling - is that over digital as the 700s certainly did a 4 x 3 zoom to give the so called "vertical stretch" over component...

Mark

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post #120 of 636 Old 03-08-2006, 10:49 AM
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Quote:
Originally Posted by CAVX View Post

Jack,

the lack of scaling - is that over digital as the 700s certainly did a 4 x 3 zoom to give the so called "vertical stretch" over component...

Mark

But won't that 4X3 zoom just get you back to 16X9, not 2:35.
Right?

Mike
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