Sony VPL-VW1100ES "V Stretch" and ISCO 1.25x A-Lens - AVS Forum
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post #1 of 8 Old 05-19-2014, 01:23 PM - Thread Starter
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I've set up my VPL-VW1100ES with ISCO 1.25x A-lens (woo hoo! yes!) - getting a beautiful image that's 167 inches wide but only 64 inches tall (2.60:1 AR) with Aspect Ratio set equal to V Stretch. Why is this? I've of course picked the 1.24x lens option under Installation. But even without the A-lens, when I click V Stretch AR, the top and bottom of the images are cropped by a few inches. Why does this happen and how to fix it? I've played around with Picture Position stuff - but this doesn't do anything as far as cropping goes. I'm sure someone knows the answer to this - I called Sony and they were clueless - they've never even seen an anamorphic lens-smile.gif When I try to play a bluray disc, I have to change AR to like "Squeeze" or "Normal" or something else to even access disc menu since they're mostly at the bottom - but end up getting cropped when I click "V Stretch" AR.....
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post #2 of 8 Old 05-19-2014, 07:49 PM
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What ratio is your screen?
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post #3 of 8 Old 05-19-2014, 08:02 PM - Thread Starter
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I'm projecting on a wall at the moment - will acquire a screen after I've resolved all AR issues - so, I can go up to a max. width of ~167 inches and height is no problem obviously...
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post #4 of 8 Old 05-20-2014, 12:02 AM
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Quote:
Originally Posted by RS3771 View Post

I've set up my VPL-VW1100ES with ISCO 1.25x A-lens

Is this SONY one of the new 4K 17:9 projectors?

I got to see the SONY 4K unit late last year and it was 17:9. It had a pixel count of 4096 x 2160 and it would have required a 1.25x A-lens in that mode. It could be set to 16:9 and use a standard 1.33x lens but its output would have been clipped back to 3840 x 2160.

As for the some of the image disappearing, yes that is supposed to happen when you scale for CIH regardless of what set up you have.

The goal of CIH is to keep all ARs at the same height. Yet video is based on a CIW concept, so when the image is scaled, the ends of the image remain and the top/bottom get clipped which we hope are the black bars.

Think of it like this - a BD is 1920 x 1080. The letter-boxed portion is 1920 x 810 with the remaining 270 vertical pixels being used (wasted) on black bars.

When the projector scales the image, it essentially re-maps the image as if the chip was 1920 x 1440. Because there is only 1080 on the vertical, the remaining image is lost.

This is IDEAL for losing those black bars, but as you noticed, also removes some image from a 16:9 frame such as menu page as well.

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I love my Constant Image Height system!
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post #5 of 8 Old 05-21-2014, 05:39 PM - Thread Starter
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I'm sending some pics. along with notes; hopefully, this will explain it better....

Disc.MenuTruncated.jpg 386k .jpg file

Disc.MenuVisibleinSqueezeAR.jpg 325k .jpg file

VStretchARtruncatedtopandbottom.jpg 307k .jpg file

2.35-1ZoomARNoVStretch.jpg 310k .jpg file

2.35-1zoomARblurayplayerVStretch.jpg 335k .jpg file

Will follow-up later...Thanks for your response
Attached Images
File Type: jpg Disc.MenuTruncated.jpg (386.4 KB, 43 views)
File Type: jpg VStretchARtruncatedtopandbottom.jpg (307.1 KB, 35 views)
File Type: jpg Disc.MenuVisibleinSqueezeAR.jpg (325.3 KB, 40 views)
File Type: jpg 2.35-1ZoomARNoVStretch.jpg (310.1 KB, 42 views)
File Type: jpg 2.35-1zoomARblurayplayerVStretch.jpg (335.0 KB, 43 views)
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post #6 of 8 Old 05-22-2014, 12:23 AM
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You will get clipped menus in a CIH system using an A-Lens if the menu us formatted for a 16:9 display.
Some movies are now formatted so their menus are CIH safe, but this is not common.

The challenge you face is that your system does not conform to the usual 1.33x thing of video.

You can not use anything that works off the standard 133% for your set up because your optical stretch is 1.25x or 125%.

100 x 1.33 x 0.75 = 99.75
100 x 1.25 x 0.80 = 100

So either just use and trust the projectors scaling or employ a dedicated scaler. Not sure what scaler even works for 4K.

Mark Techer

I love my Constant Image Height system!
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post #7 of 8 Old 06-27-2014, 03:30 AM
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Maybe you should expand 3840 to 4096 first.
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post #8 of 8 Old 06-27-2014, 05:41 AM
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If the projector is already scaling to fit the width, then some of the height will go as well. Hope this makes sense.

1920 x 1080 = 16:9 = 1.78:1
2048 x 1080 = 17:9 = 1.89:1

3840 x 2160 = 16:9 = 1.78:1
4096 x 2160 = 17:9 = 1.89:1

Letterboxing on a BD will vary from 1920 x 800 to 1920 x 816 [3840 x 1600 to 3840 x 1632 in 16:9 mode]

Letterboxing on a 2K system will vary from 2048 x 854 to 2048 x 872.

Letterboxing on a 4K system will vary from 4096 x 1708 to 4096 x 1744

Look at those figures in bold and there is 112 pixels of difference.

Mark Techer

I love my Constant Image Height system!
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