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What The Heck Is Digital NIR Photography?

nir

Introduction to Infrared

  • Near IR (730-900 nm) NIR
  • Far IR (900-1200 nm)
  • Thermal IR (6000-7200 nm) - National Geographic

Tim's NIR photos used during the presentation.

IR Normally Invisible to Humans - When we can see it - reflected

  • NIR- White is White,
  • Black is Black (Neutrals)
  • Greens are different shades of white,
  • Blues are different shades of black &
  • Reds are shades of gray
  • Used In TV Remotes & Some Flash Guns
  • Used in Agriculture to detect diseased trees and Plants

Ways of Rendering NIR Images

  • Film Cameras (Special IR Film,
    • Difficulty Loading Film, Focusing
    • Problems & Expensive Processing)
  • Film IR Experience-
    • Ag. Folks can detect Diseased Plants w/Aerial IR
  • Digital Cameras- Much less involved,
    • No special film,
    • No focusing problems,
    • but all have hot or IR blocking mirrors
  • P&S often are better (Discuss) than DSLR
  • Digital Cameras I’ve Used-method to determine if camera can see IR
  • DSLR’s need to be modified generally to work well for NIR- Pros & Cons
  • If using the IR filters on an unmodified DSLR- expect focusing difficulties & Long exposure times
  • Some cameras that can be used – with filter sizes
    • Nikon 950/990 28mm
    • Sony MiniDV camcorder 37mm
    • Canon DV camcorder 30.5mm
    • Sony Cybershot 5.0 MP (DSC-F707) 58mm

Needed to Shoot Digital NIR

  • P&S Digital Camera with IR Filter
  • DSLR with Filter (Unmodified)
  • Tripod a necessity with the above two
  • Modified DSLR (Hot or Blocking Filter removed & replaced with IR Filter) - Tripod unnecessary, no focusing difficulties

Filters for NIR

  • Wratten 89-B- very dark, black-red filterbest for most Digital Cameras. Produces a mild “IR Look” & yet gives useful speed response to the camera
  • Wratten 87 is a typical black IR Filter which scarcely lets any visible light thru
  • There are other IR Filters- these are the most commonly used
  • Best overall source of IR Filters- Harrison & Harrison Filters. Since they are not web based you will need to call them to place an order

Harrison and Harrison
1835 Thunderbolt Drive, Unit E
Porterville, CA 93257
559-782-0121
email:HarrisonOP@aol.com

Why Shoot In IR?

  • Images often More Interesting & dramatic
  • IR cuts through haze
  • Pictures of people hide blemishes and provide a softer look- Used more now for weddings & yearbooks
  • Shows more detail in many instances

Post Processing of NIR Images

  • Can Use PS or PSE primarily Levels & change the Mode from color to grayscale
  • Also interesting to play with various filters and Blending modes

Reference Links for More Information

NOW THAT WE HAVE THE NUTS & BOLTS OF IR DOWN PAT-LET’S LOOK AT WHAT THIS UNIQUE & UNUSUAL TYPE OF PHOTOGRAPHY LOOKS LIKE!