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Focus with IR?

Discussion in 'Night Vision Optics and Illumination' started by Alex.mc, Feb 13, 2014.

  1. Alex.mc

    Alex.mc Busy Member

    Messages:
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    Location:
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    Whilst I'm still setting up the layout of my homebrew NV, I thought this evening I'd just have a go at some views of various objects to see how they looked.
    The whole setup seems pretty good, and objects 40 yards away are clear and bright. All looking very promising!

    I thought I'd better check the focus and adjust the AO on my Panorama. It I adjusted it up as I knew it was set shorter than 40 yards, nothing happened for a bit then it went out of focus! I woumd it back until it was as sharp as it could get.... looked at the AO range reading.... just above 15 Yards!!!


    Is this something to do with the wavelengths of the IR light being detected? OR a result of the camera, the lens, and the focus of the reticle?
     
  2. terry1001

    terry1001 Major Poster

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    Location:
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    The ir light does focus at a different point to white light so you will need to alter your scope focussing. If you have removed the ir filter from your camera you may notice in daylight that there is some fuzziness and you can't get things perfectly sharp.
     
  3. 32:1

    32:1 Theoben user

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    Location:
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    Could you use a ir filter or film on front of scope for day !

    If the daylight effects it without IR filter, how dark does it have to be to work ptoperly, dusk or dark ??
     
  4. genisis22

    genisis22 Engaging Member

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    Location:
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    yes you can use ir cut for day, expensive or if you saved the cut of your camera when you removed it a small hole in flip up and carefully glue ir cut over hole for daylight, for night you can use a 850nm pass filter again glued to another flip up this cuts all [ish] ambient light from cam sensor and really crisps up the image for night shooting, as the cam is struggling between ir and whatever ambient is available as there are many different wavelengths influencing the focus, as terry said you have to ignore the range markings on ao/ side wheel as they do not apply in dark with ir, just consentrate on focus and not position any way you cant see it
     

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