DIS Image Acquisition & Capture 2 — Questions and Answers
Question 1: Which metering mode evaluates light from the entire scene and averages it, giving extra weight to the area near the focus point?
- Spot metering
- Center-weighted average metering
- Matrix/evaluative metering (Correct answer)
- Partial metering
Correct answer: Matrix/evaluative metering
Matrix (Nikon) or evaluative (Canon) metering divides the scene into zones, analyzes each, and uses the focus point area as an additional factor.
Question 2: A photographer shoots indoors under fluorescent lighting without adjusting white balance. The images will most likely have a dominant color cast of:
- Warm orange
- Cool blue
- Green-yellow (Correct answer)
- Magenta
Correct answer: Green-yellow
Standard fluorescent tubes emit a green-yellow spike in their spectrum, producing a green-yellow cast when the camera is set to Daylight WB.
Question 3: In photography, 'exposure latitude' refers to:
- The geographic range in which a camera can operate
- The range of exposures within which a sensor or film can capture acceptable detail (Correct answer)
- The angle of view of a lens
- The maximum shutter speed available on a camera
Correct answer: The range of exposures within which a sensor or film can capture acceptable detail
Exposure latitude describes how far over or under a 'correct' exposure a medium can be pushed while still rendering usable detail.
Question 4: What does the term 'bokeh' specifically refer to in digital imaging?
- The sharpness of the in-focus subject
- The aesthetic quality of the out-of-focus blur in an image (Correct answer)
- The noise pattern produced at high ISO
- The chromatic fringing around high-contrast edges
Correct answer: The aesthetic quality of the out-of-focus blur in an image
Bokeh (from Japanese 'boke') describes the visual quality—smooth, creamy, or busy—of the background blur created by shallow depth of field.
Question 5: When capturing an image of a fast-moving subject, which combination best freezes motion?
- Wide aperture, slow shutter, low ISO
- Narrow aperture, slow shutter, high ISO
- Fast shutter speed, wide aperture, higher ISO (Correct answer)
- Slow shutter speed, narrow aperture, low ISO
Correct answer: Fast shutter speed, wide aperture, higher ISO
A fast shutter speed freezes motion; opening the aperture and raising ISO compensates for the reduced exposure time.
Question 6: A sensor's 'fill factor' is defined as:
- The percentage of a pixel's area that is photosensitive (Correct answer)
- The ratio of sensor size to lens focal length
- The number of pixels per square millimeter
- The percentage of light lost to lens flare
Correct answer: The percentage of a pixel's area that is photosensitive
Fill factor is the ratio of the light-sensitive photodiode area to the total pixel cell area; a higher fill factor improves light collection efficiency.
Question 7: Which type of autofocus system works by comparing image contrast at the sensor itself, requiring no dedicated AF module?
- Phase-detection AF
- Contrast-detection AF (Correct answer)
- Laser AF
- Dual-pixel AF
Correct answer: Contrast-detection AF
Contrast-detection AF drives the lens back and forth until maximum contrast is found at the imaging sensor, needing no separate ranging hardware.
DIS Image Acquisition & Capture 2
Which metering mode evaluates light from the entire scene and averages it, giving extra weight to the area near the focus point?