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Full-Spectrum Photography Flashcards

7 cards from real CPI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Full-Spectrum Photography flashcards as text

  1. Which wavelength range does a full-spectrum camera capture that a standard camera cannot?

    Answer: UV below 400 nm and IR above 700 nm

    Full-spectrum cameras capture ultraviolet (below ~400 nm) and near-infrared (above ~700 nm) in addition to the visible spectrum.

  2. What modification is required to convert a standard DSLR into a full-spectrum camera?

    Answer: Remove or replace the hot mirror (IR-cut) filter over the sensor

    The hot mirror (IR-cut) filter placed in front of the sensor must be removed or replaced with a clear glass to allow UV and IR light to reach the sensor.

  3. During a paranormal investigation, a full-spectrum photograph shows a bright orb absent in the simultaneous visible-light image. What is the MOST likely mundane explanation?

    Answer: Dust or moisture particle reflecting IR or UV light near the lens

    Dust and moisture particles close to the lens reflect IR and UV light strongly, producing orb artifacts that do not appear in visible-light images.

  4. Which filter, when attached to a full-spectrum camera, produces a pure infrared image by blocking visible and UV light?

    Answer: IR-pass filter (e.g., 665 nm or 720 nm cut-on)

    An IR-pass filter (such as a 665 nm or 720 nm cut-on filter) blocks visible and UV wavelengths while transmitting only infrared light to the sensor.

  5. In full-spectrum investigation photography, what purpose does using a UV-pass filter (e.g., Hoya U-340) serve?

    Answer: Isolates only ultraviolet reflectance by blocking visible and IR light

    A UV-pass filter transmits only ultraviolet wavelengths (~300–400 nm), allowing investigators to photograph UV-reflective phenomena invisible to the naked eye.

  6. Why is a tripod considered essential equipment when using a full-spectrum camera in paranormal investigation?

    Answer: Long exposures in low-light environments require camera stability to avoid motion blur

    Full-spectrum investigation photography often requires longer exposures in dim environments, and a tripod prevents camera shake that would blur the image.

  7. A paranormal investigator photographs a location with a full-spectrum camera and notices foliage appears white rather than green. What best explains this?

    Answer: Healthy foliage strongly reflects near-infrared light, appearing bright or white in IR-sensitive images

    Chlorophyll in living plants strongly reflects near-infrared radiation (the 'Wood Effect'), causing foliage to appear bright white or silvery in IR photography.