Photography Exposure and Metering 4

Question 1

What is 'long exposure noise reduction' (LENR) and when is it most useful?

Accepted Answer

It captures a dark frame of equal duration after the exposure to subtract thermal noise patterns

Answer

LENR takes a dark frame (same duration, shutter closed) immediately after the main exposure and subtracts its thermal noise pattern from the image.

Question 2

A photographer notices the histogram of their image has a large gap on the right side. What does this indicate?

Accepted Answer

The image is underexposed and could be brightened to use more of the dynamic range

Answer

A histogram with empty space on the right side means the image is underexposed — there are no bright tonal values being recorded and exposure could be increased.

Question 3

What is the reciprocity failure phenomenon, and for which type of photography is it most relevant?

Accepted Answer

The breakdown of the linear relationship between exposure time and film density at very long exposures; most relevant to long-exposure film photography

Answer

Reciprocity failure occurs in film when very long exposures (seconds to minutes) require additional exposure beyond what calculations predict because the film's response becomes nonlinear.

Question 4

A photographer sets shutter speed to 1/250s and aperture to f/8 at ISO 400. To maintain the same exposure while switching to f/4, which adjustment is needed?

Accepted Answer

Change shutter speed to 1/1000s

Answer

Going from f/8 to f/4 gains two stops of light, so the shutter speed must be increased by two stops (1/250s → 1/500s → 1/1000s) to compensate.

Question 5

What is 'exposure bracketing' and why do photographers use it?

Accepted Answer

Capturing a series of shots at different exposures to ensure at least one is correct or to merge into HDR

Answer

Exposure bracketing shoots the same scene at several exposure values (e.g., -2, 0, +2 EV) to ensure an ideal exposure or to provide frames for HDR merging.

Photography Practice Test

Photography Practice Test

Photography Exposure and Metering 4