Throw issue with Benq W1070

Discussion in 'Home Cinema Building DIY' started by bootgaz, Jul 8, 2018.

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  1. bootgaz

    bootgaz
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    Hi Peeps

    Just building a new room at the back of the house and got my screen fixed up during the week. This was to test the screen position and also to see how far back I could have it in relation to the desk area going behind the screen.

    Anyway tonight I thought I would fire up my fairly new projector and start to work out where I need to install it on the ceiling.

    Now this is where I am experiencing real issues.

    My screen is 100 inch and previously I had an optoma projector roughly about 2.5 meters away. The picture filled the entire screen and was perfect.

    With my new Benq projector I can’t see to get the picture right.

    The maximum distance I have from the screen to put the projector up is just over 3 meters. I have tried move it closer, currently on a stand, using the zoom function etc but still have problems.

    I am either getting the picture way to big or too small where I have big black gaps at the top and bottom.

    I have attached some pictures

    Any ideas greatly appreciated.
     

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  2. bootgaz

    bootgaz
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    Just had another quick measurement and the maximum distance I can go is 4 meters. I have also noticed that my projector screen has white lines going across it, I have tried to take a picture to demonstrate.
     

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  3. Nayfne

    Nayfne
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    Hi mate, is your screen 16.9, or do you have the Ben Q set to 4.3 aspect ratio?
     
  4. bootgaz

    bootgaz
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    I have go through and tried all the different aspect ratios. I have uploaded a picture of my screen sizes.
     

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  5. Abacus

    Abacus
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    Looking at the pictures it appears to be a 4:3 ratio screen whereas the Benq is a 16:9 ratio projector, (As are most Home Cinema projectors) so the black bars are quite normal and the only way to fix it is to get a 16:9 ratio screen. (I suspect your previous projector had a 4:3 ratio hence you did not have any problems)

    Also the pictures of the screen don’t seem to match the measurements you provide, so do you have the name and model number of the screen so we can check. (Same for your previous Optoma projector)

    Bill
     
  6. bootgaz

    bootgaz
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    Hi

    Thanks for the information. I have attached a picture of my screen. It does say 16:9 in the description.

    My previous projector was a Optoma HD65
     

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  7. IronSoldier

    IronSoldier
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    Compare the screen shown in post 4 to that of what you've received in the pictures. It seems that it is intended to have a bar bar at the top after roll down to make it 16:9 whereas yours seems to be missing it, perhaps making it 4:3. Yet other pictures of simulated images are somewhat different.

    Take measurements of the white screen area. Divide width by height and see what you get. 16:9 should come up about 1.78 whereas 4:3 will result in 1.3.
     
  8. Joe Fernand

    Joe Fernand
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    'Thanks for the information. I have attached a picture of my screen. It does say 16:9 in the description.' - it looks like someone shipped you the wrong screen or the box has been mislabeled.

    Joe
     
  9. bootgaz

    bootgaz
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    Thanks again, I can pull down the projector screen further which does then give me a large black bar at the top but I never previously pulled it down that far because the picture can’t be see on the black bar so it seems pointless to pull it down all the way.

    I want the picture to fit the entire screen if possible, and thought this would be achievable considering I can move the projector anywhere within a 4 metre range
     
  10. Joe Fernand

    Joe Fernand
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    You need to return the screen - you can mess around all you want with the projector, it will never ‘fill’ that screen with a 16:9 image.

    Joe
     
  11. bootgaz

    bootgaz
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    Thanks again Joe

    What I don’t understand is that with my previous optoma projector display 16:9 the picture filled up the entire screen and was fine. Is the issue because I now have a short throw projector?
     
  12. Abacus

    Abacus
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    Go into the projector menu and select the 3rd tab along, (Make sure you have an image being sent to the projector) then highlight the Aspect Ratio and select 4:3, (Use the arrow keys) you should now be able to adjust the zoom knob to fill the screen.

    If the above works, (I suspect it will) then it confirms you have 4:3 screen and not a 16:9 screen, so will need to be replaced.

    NOTE: The Optoma HD65 can also be set to output a 4:3 image, which is what I suspect is what it is set as. (Remember, the actual aspect ratio selected will only be shown when an image is being sent to the projector)

    Bill
     
  13. Joe Fernand

    Joe Fernand
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    With the Projector in 16:9 mode and the image aligned to the top edge of the screen I’m guessing you only had a certain amount of screen ‘rolled out’.

    Joe
     
  14. bootgaz

    bootgaz
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    Hi Joe

    Yes thats correct, I can pull the screen down a bit further which exposes a larger black border.

    Abacus - I always make sure I set my aspect ratio to either auto or 16:9. I know that 4:3 isnt ideal so i made sure on my old and new projector that this is the set ratio.

    Sorry guys, just so confused. I am using Apple TV and Blurays as my input and on my previous projector set at 16:9 on the same screen the picture filled up the white screen entirely.
     
  15. MJC UK

    MJC UK
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    Have you got the 1070 or 1070ST? I have the 1070 and I’m sure I get a screen size of roughly 120” at just over 3m away @ 16:9 when using my Apple TV
     
  16. bootgaz

    bootgaz
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    I definitely have the W1070, at 3 meters the picture is too wide for my screen. But moving it closer or further still causes the picture to be too big. If I move the projector closer I can get the picture on the screen but I then have large white gaps at the top and bottom
     
  17. Joe Fernand

    Joe Fernand
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    'Yes thats correct, I can pull the screen down a bit further which exposes a larger black border' - I was more thinking you had the screen rolled up so that you filled the visible bit with a 16:9 image.

    Roll the screen fully out, dig out your tape measure, measure the white area (Width and Height) and post the dimensions.

    Joe
     
  18. bootgaz

    bootgaz
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    Hi Joe

    Just measured up so just the white screen measurements are as follows.

    Height - 60 inches

    Width - 80 inches

    Diagonal is - 100 inches
     
  19. Joe Fernand

    Joe Fernand
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    80" x 60" visible area = 4:3 format screen.

    You are looking for an 80" x 45" visible area for a 16:9 image.

    Joe
     
  20. MJC UK

    MJC UK
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    The image you posted says it should be 48.8 x 80, so alarm bells should ringing immediately

    Using your measurements and dividing width by height, works out at 1.3 = 4:3, as posted above

    Time to send it back
     
  21. bootgaz

    bootgaz
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    Hi guys

    Thanks for the info, can’t send it back as I have had it a few years. Is 4:3 ok or should I be looking at getting a 16:9 screen. Are the actual screens bigger as I can’t fit anything bigger width wise to the beams. See pic.
     

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  22. Joe Fernand

    Joe Fernand
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    'Is 4:3 ok or should I be looking at getting a 16:9 screen' - the majority of what you are likely to be watching will be in a 16:9 (or wider) format so using the whole of the 4:3 screen is not going to work too well.

    If replacing the screen is not an option you have a few options using the full width of the 4:3 screen:

    A. View with a white area above the projected image.

    B. As above and add a black 'mask' above the image.

    C. Lower the canister away from the ceiling joist and roll out just the height required for 16:9.

    D. Leave the canister where it is, roll out just the required height for a 16:9 image and adjust the height of the projected image.

    If replacing the screen is an option and you are making this a dedicated Cinema Room you could consider a fixed frame AT (acoustically transparent) screen surface and mount your Front LCR Loudspeakers behind the screen, you can do a DIY AT screen on a tight budget.

    Joe
     
  23. bootgaz

    bootgaz
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    Hi Joe

    Thanks for the constructive feedback. So I have lowered the screen to 45 inches to make a 16:9 screen. We are now getting somewhere and have posted a pic of the Apple TV menu. The only issues I have now is that when watching a film (Greatest showman in this case) the Picture is again smaller on the screen with gaps at the top and bottom.
     

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  24. Abacus

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    This is normal as most films have an aspect ratio of 2.40:1 (2.35:1) hence the upper and lower bars.

    Bill
     
  25. Joe Fernand

    Joe Fernand
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    As Bill says Movies can often be shot/displayed in formats other than 16:9 - some even bounce around between formats within a Movie to add drama to sections of the Movie.

    Unless you get into Screen masking, anamorphic lens, projector zoom presets, external video processing... you have to take some form of ‘mid ground’ (16:9 being the norm) with your projection system and display with black bars Top and Botom or for old school 4:3 left and right.

    The top and bottom bars can vary in height depending on the format of the movie.

    Joe

    PS Lots of articles online re Movie Aspect Ratios - Film Studies 101: A Beginner's Guide To Aspect Ratios
     
  26. AFM1

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    Some images from the Web attached which may help you to visualise the different aspect ratios and how each is presented on a given screen.

    If most of your viewing is TV or TV series then I'd get a 16:9 screen (or just roll you current screen down so far for a 16:9 visible ratio like you've done), but widescreen 'scope' movies in 2.35:1 (or 2.39:1 or 2.40:1) will have black bars top and bottom. But to counter that roll your screen up a bit to remove (if you can easily adjust you PJ height that is).

    But if main viewing is movies then the best bet is a scope screen of the same width just less height. TV stuff in 16:9 (and most menu screens) will then have gaps at the sides rather than top and bottom.
     

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