Confused by Optoma HD70 Letterbox (LBX) setting - AVS Forum
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post #1 of 15 Old 01-10-2007, 03:53 PM - Thread Starter
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What exactly is the LBX aspect ratio setting for?

Sometimes I watch 4:3 material that is letterboxed; that is, it has black bars on top and on the bottom. If I set the aspect ratio to 16:9, the image is just stretched too wide. The same thing happens with LBX. In fact, I have never seen any difference between LBX and 16:9 with the HD70. So what am I missing?

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post #2 of 15 Old 01-10-2007, 05:51 PM
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it's for widescreen (2.35:1) viewing. dont worry about it and dont use it.
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post #3 of 15 Old 01-11-2007, 02:42 PM
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Not true!!!

Anamorphic does not mean 2.35:1!

If you watch a non-anamorphic widescreen image (like widescreen VHS tapes or some DVDs) in 16:9 mode the image will appear stretched horizontally. If you watch it in 4:3 mode it will have the correct aspect ratio, but it will have black bars on all 4 sides. The letterbox mode zooms the image to 16:9 mode. The result is a full size 16:9 image with lower resolution than an anamorphic widescreen image due to the zoom.
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post #4 of 15 Old 01-11-2007, 03:11 PM
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yes LBX zooms in on all 4 sides...when I watch a movie thats in widescreen format but standard def and being feed through a reciever set up to feed in 4:3 format I hit LBX and the actual image fills the screen perfect and it stays the right aspect ratio (it saves me changing the display output on my sat reciever to 16:9 which would stretch everything that was actually 4:3)this way nothing I watch is stetched or squished. It will also zoom 4:3 material to fix 16:9 screen format if you like having the top and bottom of the image chopped off... I'm not sure but I think if your already watching widescreen material in 2:35 format and you hit lbx it only zooms vertically to remove black bars (anamorphic lens would be used here) although I'm not positive.
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post #5 of 15 Old 01-12-2007, 05:50 AM - Thread Starter
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Quote:
Originally Posted by augiedoggy View Post

yes LBX zooms in on all 4 sides...

Not on my HD70. bubbastyle123 appears to be right - it makes sense that it's only for anamorphic widescreen.

Ok, the question then becomes: why does 16:9 do the same thing as LBX? If I have a non-anamorphic widescreen picture (with a 16:9 aspect ratio) on my 4:3 image (S-Video TV signal, for example), how do I get it to fill the screen? Switching to "LBX" or "16:9" does the same thing. "Native" just makes it smaller.

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post #6 of 15 Old 01-12-2007, 08:10 AM
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If LBX and 16:9 do the same thing then your projector is not working correctly. Try it again - switch between 16:9 and LBX modes. The black bars should be smaller (or disappear) in LBX mode.
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post #7 of 15 Old 01-12-2007, 09:34 AM
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LBX is supposed to be used in conjunction with an anamorphic lens. If you are watching an anamorphic or widescreen DVD that has the letterbox black bars, if you use the LBX setting, it is supposed to vertically stretch the image to use all of the pixels. It will look noticeably stretched. The add-on anamorphic lens, whether it be a vertical compression or horizontal expansion, will then return the picture to its normal 2.35:1 aspect ratio (using all the pixels and keeping most of the lumens), only without the black bars. If you do not have an add-on anamorphic lens, you should not be using the LBX setting.
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post #8 of 15 Old 01-12-2007, 09:45 AM - Thread Starter
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Ok, then what about 16:9? When I watch a widescreen DVD, switching to 16:9 fills the projected image. But if I watch a widescreen TV show, pressing 16:9 just stretches it wide.

The only thing I can think of is that TV is connected via S-Video, and DVD via component. But why should that matter?

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post #9 of 15 Old 01-12-2007, 11:23 AM
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Watching a widescreen DVD (non-anamorphic) will be native 16:9, so it should fill the screen when you press 16:9. If, however, when watching widescreen TV, when you press 16:9 you get a horizontal stretch that is not natural, the only thing I can think of is that the broadcast really is not native widescreen (i.e., 6:9) but rather is native 4:3 and probably not HD then. You may be getting 4:3 commercials in what is otherwise a 16:9 broadcast. It might stretch those commercials out of proportion.

Widescreen = 16:9. Stadandard = 4:3. Anamorphic or Cinemscope = 2.35:1 or 2.37:1 or 2.40:1, etc.
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post #10 of 15 Old 01-12-2007, 11:53 AM
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I think that you need to use zoom to fill the screen in your situation. You're watching an SD program, or it would be wide to begin with. Use zoom to fill the screen. The only problem I have with doing that is it emphasizes how bad SD really is. I'd rather leave it small than see a blurry large picture.
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post #11 of 15 Old 01-12-2007, 12:23 PM
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From the HD70 owner's manual:
LL
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post #12 of 15 Old 01-12-2007, 01:28 PM
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like i said, DONT WORRY ABOUT IT.

if you dont know what it is, chances are that you arent going to drop thousands on a 2.35:1 lens to use it.

garsh.
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post #13 of 15 Old 01-12-2007, 04:40 PM
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Ya don't need a special lens... just need to read the manual.
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post #14 of 15 Old 01-12-2007, 05:17 PM
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no, you need a lens. what the manual is trying to say (and the manual sucks, btw) is that if you are feeding 2.35:1 to the PJ (notice the thin black bars), LBX will squish it so you can put on a lens on it to strech it back out.

everyone needs to stop reading manuals and stop asking questions and just sit down and push the button...what happens? oh yea, i was right. it squishes the image and is only useful (and specially included) for people with a constant 2.35:1 setup. which none of you have, so...

DONT WORRY ABOUT IT.
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post #15 of 15 Old 07-10-2012, 01:22 AM
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Hi everyone

Excuse me for jumping in on this section, was hoping someone might be able to help on this issue I have recently encountered.

I have a question reference to 3D viewing and have a similar situation as to the how to extend the picture to full screen, as there is no option to select LBX when viewing 3D content.

Never had this happen on 2D as the projector allows me to choose all the ratios ie 4.3, 16.9, LBX, Native but once I play 3D content this option is not available from my projector.

My equipment list installed and working.

1 Optoma HD8300 3D projector ( Previously running the Optoma HD80 )
2 Anamorphic Lens ( Optoma BX-AL133 )
3 Panasonic DMP-BDT500 Integrated Wi-Fi 3D Blu-ray DVD Player ( Just bought that recently for 2 HDMI out )
4 Yamaha amp with 7.1 speaker setup ( older version hence the panasonic for dual hdmi output )

The installation for the above is fine and works great. But my issue I now have is when viewing 3D movies which are made in widescreen. ie Transformers 3D and many others.

I cannot seem to control the image as I have black bars top and bottom on 3D with the anamorphic lens and the projector does not let me choose LBX as it normally allows with the 2D movies.

I am no expert on display content and dont understand the format.
Is there a way to get 3D movies on full screen without the extra expense of buying other devices to eliminate the black bars top and bottom?

Greatly appreciate any comments to this and look forward to hearing from the experts out there.

Thanks

Ameer
Orlando Florida USAReplyQuote Multi 0
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