CPI Full-Spectrum Photography 2

Question 1

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

Accepted Answer

UV below 400 nm and IR above 700 nm

Answer

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

Question 2

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

Accepted Answer

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

Answer

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.

Question 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?

Accepted Answer

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

Answer

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.

Question 4

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

Accepted Answer

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

Answer

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.

Question 5

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

Accepted Answer

Isolates only ultraviolet reflectance by blocking visible and IR light

Answer

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

(CPI) Certified Paranormal Investigator Practice Test

(CPI) Certified Paranormal Investigator Practice Test

CPI Full-Spectrum Photography 2