Does Zoom affect picture quality?

Discussion in 'Projectors, Screens & Video Processors' started by CrackDown, Aug 26, 2004.

  1. CrackDown

    CrackDown
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    I'm planning on getting a Hitachi TX100 soon, and will be using a 105" diagonal grandview electric screen (i hope). The one problem is that the throw distance is going to be about 10ft. Using the projector calculator on projector central is says that I will be able to achieve this with a zoom of 1.58. I want as big a picture as I can get but not lose picture quality.

    Any help?

    Thanks
     
  2. windfall

    windfall
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    I dont believe optical zoom affects picture quality. Just thinking of my photographic days, cant see how it would but I can be wrong...as I am told by my ex-wife!

    Tone
     
  3. inzaman

    inzaman
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    Yep women are always right :rolleyes:

    There is 'supposed' to be a sweet spot with the zoom, but tbh i have never seen a difference.
     
  4. RTFM

    RTFM
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    From experience I would say the narrow end of the zoom gives best results.
    At the wide end of the zoom you are more likely to get chromatic aberration, pin cushion or barrel distortion and focus at the edges may not be as good.
    The reason for this is the angle refraction is greater at the wide end of the zoom. At the narrow end of the zoom you are using a much smaller area of the objective lens.

    Jeff :rtfm:
     
  5. windfall

    windfall
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    So if I read you correctly if you are on mid to max zoom you will get a good pic?

    Cheers

    Tone
     
  6. Peter Parker

    Peter Parker
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    Adding to Jeffs comments:

    Using the zoom to create the smallest image I believe, and move the pj back fior the required size.

    The light is focussed tighter, so you get less light scatter within the lens so (in theory) greater contrast. It also means more light should reflect back to the viewer as the angle is tighter.

    I don't know if I'd see the difference to be honest though. :)

    Gary.
     

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