Question about Infrared, night vision, and ultra violet

Discussion in '35mm Cameras' started by ~~~Cindy~~~, Nov 7, 2003.

  1. ~~~Cindy~~~

    ~~~Cindy~~~ Guest


    Not sure if this is the place to get all my answers but I'm looking
    to find out just how infrared, night vision, and ultra violet works.
    About the Vibrations in energy and why we can't see them...and
    anything really that can be known about it. Any help? Or can you
    direct me to the correct group to post this on?

    ~~~Cindy~~~, Nov 7, 2003
    1. Advertisements

  2. ~~~Cindy~~~

    Alan Browne Guest
    Alan Browne, Nov 7, 2003
    1. Advertisements

    Tony Parkinson, Nov 7, 2003
  4. ~~~Cindy~~~

    Don Stauffer Guest

    IR and UV are merely photons outside our eye's 'tuning' range. Just
    like a radio only picks up a certain range of frequencies, the
    photochemical process in our retinas only convert photons with a certain
    range of frequencies to nerve signals.

    Indeed, for color vision our eyes have three different types of 'cones',
    the photorecepters that give us color vision. One set responds only to
    red light, a second set to green light, and the third set to blue light.

    At night, another set of more sensitive photorecepters responds to
    feinter light, but to red, green OR blue, so we don't see color at

    There ARE photosensors that respond to IR, others to UV, and these are
    used in UV and IR sensors. Also, some electronic devices vary the
    current through them as a function of temperature, and these are used in
    one kind of IR camera, the cheaper kind. I am talking about THERMAL, or
    long wave IR here, not the near IR that certain digicams can see. The
    later see wavelengths of IR that are only barely beyond capability of
    Don Stauffer, Nov 8, 2003
  5. Sheppard Clan, Nov 8, 2003
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.