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Z2 Lens Shift Question

Discussion in 'Projectors, Screens & Video Processors' started by KraGorn, Oct 27, 2003.

  1. KraGorn

    KraGorn
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    Would I be right in thinking that this feature is better than keystone adjustment via image processing since it doesn't introduce distortion which degrades PQ due to resampling?

    I was always disappointed with my AE300 in that although it had great keystone adjustment ability on paper, in practice it was largely useless due to loss of PQ.
     
  2. inzaman

    inzaman
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    It appears so reading the Z2 manual that can be downloaded from this forum. From the manual it quotes that you can shift the image using the lens shift facility without degrading the picture quality. It saeems that the image can be shifted quite a lot either horizontally, vertically or both which makes this projector very useful if like me you cannot ceiling mount
     
  3. KraGorn

    KraGorn
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    I have the same reason for being interested in this feature.

    I did read the brochure, but then I read a lot of fiction these days ;) .. I was trying to ascertain whether it's REALLY the case that there's no image distortion. :)
     
  4. Messiah

    Messiah
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    Lens shift introduces absolutely no distortion whatsoever as it physically moves the lens/optics.
     
  5. nunew33

    nunew33
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    Er.......where? (as in wheres the manual not where in the manual....you know what I mean)
     
  6. The Hemulen

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    Although the geometry is unafected, won't it cause problems with light uniformity though? If for no other reason than if it is offset then the distance from the near vs far side of screen must be quite different.
    In fact a lot different if used to its limits...
     
  7. Anders_UK

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    Yep, the lens is designed with a larger 'field of view' than a normal on-axis lens would be. Therefore the lens can deal with a theoretically bigger rectangle, but because the chip size is fixed then it can be physically moved around to the boundaries of the theoretical rectangle.

    Although the lens-shift functions will operate together you will never ever be able to achieve the maximums in both diections i.e. you will not be able to have 100% vertical with 50% horizontal. This is because you are dealing with rectangles through a circular lens and you will end up cutting a corner off somewhere. The more vertical shift you put in the less horizontal you have to play with and vice versa.

    Normally lens shift is calculated or at least specified by ratio to your picture size.
     
  8. Anders_UK

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    Ah light uniformity, you can always open up your little projector and adjust the angle of a mirror known as 'the cold mirror' - this has the job of reflecting the light back into the optics from the bulb and will effect the uniformity across the panel and ultimately the image. That'll do the trick nicely.

    Failing that you can work out the uniformity errors you will get and adjust your screen characteristics accordingly.
     
  9. KraGorn

    KraGorn
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    Messiah: thanks for the confirmation. :)

    In my case ideally the pj would be about 2' off axis horizontal projecting on to a 92" screen ... 3' would be nice but I could live with 2. The AE300 didn't like that amount of keystone adjustment, while it could handle it the image distortion to me seemed excessive.

    Damn I'm getting tempted .. but I'm going to wait till I see how the thing performs, I'm not one of your bleeding-edge walkers on tech things these days. :blush:
     
  10. inzaman

    inzaman
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    nunew33 i didnt mean manual, the keyboard just wouldnt let me type brochure, honestly. I meant the pdf brochure that you posted the link to in an earlier post
     
  11. codling

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    probably a supid question.

    can you still ceiling mount the z2(pj upside down)or is it still upright when ceiling mounted and use the lens shift to drop the image?
    does this make sense:confused: .


    carl
     
  12. Bristol Pete

    Bristol Pete
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    could just flip the image in the picture menu.

    by the way, as a former Z1 owner I recall the manual stating that using zero lens shift resulted in the best PQ.

    Seems odd, but thats what it said:confused:

    Mind you, lens shift is the new rock n' roll. All PJ's should have this.

    Cap

    :smashin:
     
  13. buns

    buns
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    no no, its still for upside down mounting, hence the ceiling mount holes in the bottom

    ad
     
  14. rnoble

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    I can't find the link now but theres a (Swedish?) AV company with avi's of the lens shift function being shown on the net. I think the links are from AVS forum or maybe somewhere in this one.

    From Japanese brochures and information they claim there's no reduction in image quality when using this function. We'll have one in a week so I guess you'll find out soon!
     
  15. theritz

    theritz
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    The clip was taken by Grobi some weeks ago, they were the first ones out with hard info on the Z2 - they've had to take it off their server but they'll email it to you if you ask them. Check here for details.




    Sean G.
     
  16. theritz

    theritz
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    Check out the illustration on this site - it shows the lens shift capability quite well - came across an animated one the other day, but can't find the link off-hand.......................


    Sean G.
     
  17. nunew33

    nunew33
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    Is this the avi Movie of it here http://franckhc.free.fr/comparoDownload.htm (shows you demo of shift function)
     
  18. theritz

    theritz
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    Nunew33,

    Yip, that's the one (WMV, 5.8Mb) made by Grobi.


    Sean G.
     

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