Which of the following is NOT a factor contributing to a properly exposed photograph (according to basic guidelines)?

• A. Amount of light
• B. Size of lens opening
• C. Shutter speed
• D. Color temperature

Answer: (D)

Proper exposure is determined by how much light actually reaches the sensor, which you control with the aperture (size of the lens opening), shutter speed (how long the sensor is exposed), and ISO (sensor sensitivity). Color temperature, on the other hand, is about white balance—it affects the color cast of the image, not the amount of light hitting the sensor. So while changing white balance can alter how the scene looks in color, it does not change the exposure level. That’s why color temperature is not a factor in achieving a properly exposed photograph. The other three choices directly influence the amount of light captured and thus the exposure.