Image Acquisition & Capture Flashcards
7 cards from real DIS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Image Acquisition & Capture flashcards as text
When a photographer uses 'exposure compensation' of +1 EV, the camera will:
Answer: Increase exposure by one full stop, delivering twice as much light to the sensor
+1 EV doubles the amount of light reaching the sensor by adjusting one or more of shutter speed, aperture, or ISO depending on the active metering mode.
In medium and large format digital capture, a 'scanning back' acquires images by:
Answer: Moving a linear CCD row across the image plane to build the image over time
A scanning (or trilinear) back uses one or three rows of sensors that sweep across the focal plane over several seconds, requiring subjects and lighting to remain perfectly still.
What does 'focus breathing' refer to in photographic lenses?
Answer: The change in angle of view / apparent focal length when the lens is focused at different distances
Focus breathing is the change in the image's field of view as focus distance changes, often seen in video when pulling focus between near and far subjects.
A photographer captures an image and notices a repetitive pattern artifact (moiré) on fabric with fine weave. The most likely cause is:
Answer: Interference between the fabric's spatial frequency and the sensor's pixel grid
Moiré occurs when the periodic structure of the subject (e.g., fine fabric weave) aliases with the regular pixel grid of the sensor, producing wavy interference patterns.
Which of the following describes 'exposure bracketing' in digital capture?
Answer: Capturing a series of frames at different exposure values around the metered exposure
Exposure bracketing shoots 3 or more frames at predetermined EV intervals (e.g., -1, 0, +1) to ensure at least one optimal exposure or to enable HDR merging.
A camera's 'electronic front-curtain shutter' (EFCS) mode is designed primarily to:
Answer: Eliminate the vibration and shock from the first shutter curtain's mechanical travel
EFCS replaces the mechanical first curtain with an electronic reset, eliminating the micro-vibration that can cause blur at certain shutter speeds, especially with heavy telephoto lenses.
When using a tilt-shift lens for architecture photography, the 'shift' movement corrects:
Answer: Converging vertical lines caused by tilting the camera upward
Shifting the lens parallel to the sensor plane keeps the film/sensor back vertical so the camera doesn't need to tilt, preventing keystoning (converging verticals).