Stripes from a Sony CX1

Discussion in 'Projectors, Screens & Video Processors' started by samwiley, Sep 10, 2001.

  1. samwiley

    samwiley
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    I recently bought a Sony CX1 and occasionally notice feint vertical stripes (like a neatly mown lawn) in some scenes.

    It's most noticable when there's a wide expanse of blue sky but it also shows up in scenes with large areas of pale grey/green (office walls when Neo is being interrogated by Agent Smith in The Matrix).

    Has anybody else notice the same effect on this (or any other) machine and is there anything I can do about it ?

    Sam
     
  2. Noel

    Noel
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    Yep, I sometimes get it (but not always!?). Don't know what it is, but it seems to show up more often on composite than s-video.....

    How are you getting on with it otherwise?
     
  3. samwiley

    samwiley
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    Noel

    It's been a bit of a love/hate relationship so far !!

    I bought it based purely on the VFM factor - budget is tight, and I simply coudn't afford any more at the moment.

    As this is my first PJ I didn't want to blow mega bucks and then realise that I really didn't use it that much - so £1300 seemed a good deal.

    To be honest I was disappointed to start off with, I found it noisey, I suffered quite badly from 'screen door', the light spill from the unused parts of the 4:3 panel were very distracting and I gave up watching The Matrix after 30min as the blacks were so washed out I though I'd suddenly developed cataracts!!

    I actually tried to take it back to PC World but guess what - no joy.

    But now I'm glad they didn't, now I love it and managed to sit through and thoroughly enjoy The Matrix. And what has brought about this change of heart?

    Paint !

    Over the weekend I constructed a screen from 8*4 MDF and painted it with Dulux Ice Storm as suggested in a previous thread and masked in the true 2.35:1 screen to remove the light spill and Hey Presto! virtually all my gripes disappeared. The blacks were much more what I expected and the colours were rich and gorgeous.

    I'm in the process of building a hush box and then I think I'll have a PJ that will certainly do me until I can afford to upgrade - by which time I imagine that the contrast and noise levels in HT projectors will have improved considerably.

    The only cloud on the horizon are these stripes (but they are very feint using s-video)

    So there's my story - and for the money I think I've got a great PJ!

    Sam
     
  4. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    The vertical banding is probably due to the quality of video processing inside the unit. There isn't going to be anything you can do about it I think.

    Gordon
     
  5. jrwood

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    Which level of Dulux icestorm did you use in the end? 3, 4 or 5?. I need to get a roofrack in order to get 8feetx4feet MDF home at the moment!.

    I havent noticed any screendoor yet or strange problems although I`m projecting on to a wall at the moment which isnt ideal.
     
  6. Chris Frost

    Chris Frost
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    This is going to sound really strange, but I have seen something that produced a noticable reduction in the vertical stripes on some cheaper LCD projectors. Believe it or not, the answer was a better quality mains cable!

    This came about during a visit to a local 2 channel HiFi shop. They do all sorts of tweaks to sound systems. One of their products is a range of mains cables and power blocks.

    Andy showed me his Sanyo PLV30 wired up with the standard mains cable. We saw faint vertical lines during scenes from Gladiator (R2, Arcam DV88, Chord Co.S-video). Then he changed the mains cable it for one of their specials. A definate improvement.

    I don't pretend to know how or why this worked, and I couldn't say if the results could be repeated elsewhere. But if anybody wants to investigate further then email me and I'll give you the companies number.

    Regards
     
  7. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    I believe you Chris.

    We have a couple of weirdo mains leads. One hand made by Alan's fair hands. If I can find it in all the junk in the shop I'll give it a go.

    Gordon
     
  8. samwiley

    samwiley
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    Chris,

    Thanks for the reply - yes I'd definitely be interested in a contact number or email address.

    I have the PJ power cable is plugged into a 4 in line extension cable as well, I guess that won't help either ?

    Sam
     
  9. samwiley

    samwiley
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    jrwood

    I used Ice Storm 5 - No.4 seemed a bit dark, but I have to admit that I was tempted to go a shade darker than the one I used, maybe 50/50 4 and 5, until I realised that I had the dynamic black setting on the projector turned off. Turning it on made a much more noticable difference than when projecting on a white screen.

    BTW the great advantage of my MDF screen is that I have painted it on both sides, 16:9 on one side (that I can mask down to 4:3) and 2.35:1 on the other (which I can mask down to 1.85:1) - Four screens for the cost of a sheet of MDF and a tin of paint.

    That's what I call a bargin!!

    Sam

    [ 11-09-2001: Message edited by: Sam Wiley ]</p>
     
  10. jrwood

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    Sam that sounds great <img src="smile.gif" border="0"> , just what I want to do. How did you mask the screen though?, at the moment I`m using a custom filter in front of the projector (about 30cm from the lens) which cuts out the overspill from the projector when in 16:9 mode.

    I presume MDF is all the same thickness? <img src="smile.gif" border="0">
     
  11. samwiley

    samwiley
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    jrwood

    MDF comes in various thicknesses 6mm, 9mm, 12mm, 15mm and 18 mm. The thicker the sheet the less flexible it is - which is obviously a good thing for a screen.

    However a word of warning, it can get VERY heavy if you go too thick and if you do what I'm doing (i.e want to be able to turn it round to use both sides) then you'll need a mate/partner/fork-lift to give you a hand!!

    I've painted the masking on the board using Ice Storm No.1 (v. dark grey - it matches the grey of my KEF centre speaker).

    I did this by setting up the PJ where I wanted it, projected the aspect ratio that I required, marked the edges of the image and painted the mask area (using masking tape to get a neat line) - the effect is superb.

    To get a 4:3 aspect from the 16:9 screen, I hang two vertical boards on the screen (painted the same dark grey) and slide them to the two vertical edges of the 4:3 image - Who needs an Electrol Variable Format Screen !!

    Sam
     
  12. jrwood

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    Cheers for the info <img src="smile.gif" border="0"> , I can feel a visit to B&Q on Saturday, just need to get a roof rack!. Nice idea with the 16:9 4:3 screen, not sure what I will do but might have magnets/felt to slide up and down although not sure yet.

    For now I will get the MDF and paint it with icestorm. What thickness do you recommend as I plan to have this as a moveable screen like yourself <img src="smile.gif" border="0"> . At the moment I`m not too bothered about light spill as my lens filter system works very well too <img src="smile.gif" border="0"> . So far I am extremely pleased with this £1299 bargain and glad I didnt go for the Toshiba RPTV <img src="smile.gif" border="0"> , however cant wait for the full experience with a proper screen <img src="smile.gif" border="0">
     
  13. Luc

    Luc
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    I'm just about to build a screen with good ol carsenogenic MDF, but the only problem i have is how to attatch it to the damn wall.. How have other people done it? I want something that will be hidden behind the screen itself, but i can't find anything suitable in MFI/B&Q/Homebase etc. What have other ppl used?
     
  14. Noel

    Noel
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    JRWood, What are you using for a lens filter?

    Sam, What type of paint is the Ice Storm? (ie, emulsion, silk, etc). I've got a cheapie pull-down matt white screen which I might attack with a paintbrush.....

    Thanks,

    Noel
     
  15. Chris Frost

    Chris Frost
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    Noel,<br />Don't paint your pull down screen. When rolled, the paint will crack and fall off. Makes a terrible mess!

    Regards
     
  16. Paul D

    Paul D
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    Noel.<br /> If you really want to paint your pull down screen. Then there is a type of paint that "might" be OK.<br /> It's called "Vinyl-Cote". It is a pigment paint rather than oil based. This means it clings to the suface molacules, rather than just sitting on the surface. It is very flexible, and up to now i have never known it to crack/peel.<br /> But like all ideas, you try at your own risk!. I have used it in the past to change the colour of dashboards/leather seats/plastics in cars etc.<br />B&Q sells it.<br />It comes in several shades of grey, but don't rely on the shade on the cap, as it drys lighter/darker etc.<br />Again, this is only "IF" you really want to try this!.
     
  17. Noel

    Noel
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    Thanks guys. I guess I'm just too stingy to buy a decent grey screen!
     
  18. jrwood

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    Noel: Im just using some cardboard about 30cm away from the projectors lens. If you have the cardboard filter close to the lens it creates a fuzzy edged letterbox.

    Sam: B&Q superstores only sell the smaller sized MDF, I`m looking at 90"x60" size of MDF roughly, is this only available from a WareHouse B&Q store?. How did you transport that thing home!?, or can you get them to transit it in one of their vans? (phone order?)

    James
     
  19. Mr A

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    James,

    you may be much better off going to your local timber merchant. The one I use give good prices and deliver free. Its much cheaper and easier than trying to get 8x4 home yourself.

    Doorstep delivery and COD best way in my book.

    regards
     

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