New cheap anamorphic lens

Discussion in 'Projectors, Screens & Video Processors' started by Jeff, Oct 4, 2001.

  1. Jeff

    Jeff
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    Today someone posted some info on AVS about a new anamorphic lens (more like a prism), it should be available to buy in a months time and costs about £300-350. Alan Gouger deleted the post and has forbibben any further posts about the subject. Anyway here is the link to the company. I have emailed them for extra info, if I get a reply I'll post it.
    http://reimari.saunalahti.fi/~prismaso/

    Jeff
     
  2. jrwood

    jrwood
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    Why did he delete the post?
     
  3. Jeff

    Jeff
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    To protect us all from nasty people trying to sell us cheap goods that might work.

    Jeff
     
  4. Jeff

    Jeff
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    Some more info.


    Hello Jeff!

    Our lense is a variable rate design. It has manual horizontal squeeze control. For quite long throw projector even 2:1 squeeze can be achieved with quite acceptable image distortion. Unfortunately, the amount of pincushion depends strongly on the throw ratio of the projector. For very short throw projectors even 16:9 squeeze can be a problem. First set of our lenses will be available for sale approximately after one month. The price for the lens is approximately 500 EUROS including VAT 22%.

    we will inform more about the products in our website near future. Also many pictures, specs, prices will be added.

    Best Regards,
    Anssi Leppanen www.prismasonic.com
     
  5. Boris Blank

    Boris Blank
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    LOL, you'll get banned from AVS for that!
    Paul
     
  6. Guest

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    errr, sorry to sound stupid, but what do these lenses do, make the picture bigger ? what would they do for my sony vpl-cx1 ?
     
  7. Roland @ B4

    Roland @ B4
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    How much light do you lose?
     
  8. Guest

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    I sent yesterday a message to avs-forum about Prismasonic lens.

    The only purpose of my post was to spread information about this lens.

    However, within few hours my message was deleted

    It seems that they thought I had some commercial connections to this lens: this is not true - HT is only a hobby to me and nothing else.

    Now if I could only get my hands to that lens.... :D
     
  9. LV426

    LV426
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    Alex Simon:

    Yes, I'm absolutely sure you are right but see below

    Liver Gone: Yes, you, too, are absolutely right - but see below

    An anamorphic lens will make a native 4:3 device operate like a native 16:9 one.

    BUT: Once you've fitted the lens, all material put out by the DVD player will be treated as anamorphic - even non-anamorphic sources, which will then suffer distortion as a result.

    True 16x9 devices (widescreen TVs, VW10 projector etc) are capable of showing non-anamorphic stuff in either 4:3 or zoomed modes. A 4:3 projector with such a lens won't be able to do this. So you'll need to remove the lens when watching non-anamorphic sources. Depending on the projector's own lens' zoom features (if any) you may not be able to fill a wide screen with a letterbox (non anamorphic) image.
     
  10. Jeff

    Jeff
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    Alex,

    Yes, I think that you are right.

    Roland,

    Well it all depends on the quality of the optics, but the idea is the you gain light because you use more of the LCD panel or DMD chip.

    Jeff
     
  11. Roland @ B4

    Roland @ B4
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    The only reason I asked was Barco produced such a lens a few years ago and it lost about 50% of the light. If I recall it was £10,000
     
  12. tryingtimes

    tryingtimes
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    LV426
    Thanks for the clarification.

    I guess if you wanted to swap the lens a lot you'd need a notch or something to locate the lens in the same place each time.

    Do they make the lens to fit specific projectors? if not how do they make it fit?

    Alex
     
  13. VintageMark

    VintageMark
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    I think Jeff is right about the light..

    I have an ISCO II lens which I use with a HT200... the HT200 would normally use 30% less lines to do an anamorphic pic.. by using the the full 4:3 panel and stretching it optically the pic is brighter...

    A non technical observation of course! :)

    Mark.
     
  14. Comer

    Comer
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    Good question, does it make a pj with 4:3 lcd panels act like a pj with 16:9 lcd panels? This is a question not an answer!!!

    Comer

    [ 05-10-2001: Message edited by: Liver_Gone ]
     
  15. Jeff

    Jeff
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    OK, apart from this there are 2 other viable products on the market both of which cost a lot more money. The established product is the ISCO anamorphic lens. All it does is stretch the image horizontally by X1.33. This turns a 4:3 image to 16:9. The reason you want to do this with a 4:3 projector is that you can use the full resolution and the full panel/chip is lit giving you a more detailed image with more brightness. People who own such lenses also claim better contrast and more film like picture (less digital). To take advantage of an Anamorphic lens you need an an external scaler or HTPC to compress the 16:9 picture into a 4:3 frame. The other product on the market is the Panamorph which rather than stretch horizontally it squeezes vertically.

    Jeff
     
  16. tryingtimes

    tryingtimes
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    Surely all you have to do is tell your dvd player that you've got a 16:9 tv - the projector will scale the image to fill the lcd/dlp panel
    Have I missed something?
     

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