Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,772   Posts: 1,516,548   Online: 948
      
Page 3 of 3 FirstFirst 123
Results 21 to 23 of 23

Thread: Color Infared

  1. #21

    Join Date
    Feb 2008
    Location
    Greece
    Shooter
    35mm
    Posts
    1,322
    Quote Originally Posted by Photo Engineer View Post
    There were films that see to that wavelength and beyond.

    See attached wedge spectrograms! The long IR film data is actually truncated due to the equpment itself. The film sees beyond that a bit.

    PE
    Interesting! Have you got any idea about the expected life of such a film? How soon would it expire?

    TIA

  2. #22
    AgX
    AgX is offline

    Join Date
    Apr 2007
    Location
    Germany
    Shooter
    Multi Format
    Posts
    8,245
    PE,

    That there where at least plates sensitized up to 1100nm or so is no doubt about.

    But about your statement on their practical use in imaging covered objects the way you described.

  3. #23
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    22,883
    Images
    65
    In previous posts here, the 1000 nm was doubted.

    I doubt if I could convince you of viewing a covered object, but there are foil like camoflage blankets that supress the imaging of a hot vehicle (or cannon). You cannot see through this but can see the edges sometimes as they radiate some heat. And, they become quite hot underneath

    A plain camoflage blanket would radiate heat. You can see through this latter type of camoflage with IR film. Even so, after the truck or other vehicle left, there would be a hot ground signature that could be used to identify even the vehicle type. This is especially true in many rural areas where you can even track the vehicle to and from several stopping points by the hot spots they leave on the ground.

    It is often necessary to cover your stopping points with camoflage after you leave just to cover stop points where you may have created a supply dump.

    Basically, all I say can and has been done.

    PE

Page 3 of 3 FirstFirst 123


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin