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Lens shift - affects focus or keystone?

Discussion in 'Projectors, Screens & Video Processors' started by Snoopstah, Jan 2, 2005.

  1. Snoopstah

    Snoopstah
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    Hey,

    Can anyone tell me if using the lens shift affects 'angle' of the picture?

    I.e. if I have the projector high up, and the screen low down, but with the projector aligned perfectly horizontally and screen aligned perfectly vertically, do I need to use the keystone adjustment to get a square picture? And will the focus be the same across the height of the screen?

    Projector is an Panny 700, if that helps.

    Thanks :)
     
  2. Sporran

    Sporran
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    i just got a HS50 and am literally sitting the PJ on the box it came in, bout 12" off the floor and the bottom of the projected image is around 45-50" inches off the floor. I am using considerable lens shift and needed to give it some keystone adjustment to make it appear square and now the picture is spot on. So i guess the angle will affect the keystone. Cant see that it has affected the picture in anyway. Though im no PJ Pro.

    Need to sort a screen and mount out ;)
     
  3. PJTX100

    PJTX100
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    I use both horizontal and vertical lens shift on the TX100 to align to my screen and it doesn't introduce any keystoning (is that a word? ;) ) - the manual does say that any deviation from the centre position may degrade the picture slightly but I haven't noticed...PJ
     
  4. Snoopstah

    Snoopstah
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    Thanks guys - just finished building my DIY screen, and it's perfect - only needed a small amount of lens shift, but no keystoning effects and perfect focus all the way across! Lovely :)
     

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