Manual Mode Quiz – Master Full Exposure Control

Manual mode means you set the three exposure controls yourself: aperture, shutter speed, and ISO. Together they decide how bright the image is. Focus, white balance, and file format are separate settings that do not change exposure.

The exposure meter indicator shows where the current aperture-shutter-ISO combination sits relative to what the meter calculates as correct exposure. A reading at zero indicates a metered exposure; readings below or above indicate under or overexposure by the number of stops shown.

Start with the setting that controls the look you want. If depth of field matters, as in a portrait or landscape, set the aperture first. If motion matters, as in sports, set the shutter speed first. Then adjust the other setting and ISO to get the right exposure.

A reading of -2 stops indicates that the current settings are delivering two stops less light than the meter calculates as a correct exposure. The resulting image will be significantly darker than the metered scene, with shadow detail compressed and possible loss of detail in dark areas.

Evaluative or matrix metering divides the whole frame into zones and weighs them together to set exposure. It does well on scenes with fairly even light where nothing is far brighter or darker than the rest. With strong backlight or extreme contrast, it is more easily fooled, and spot metering is often better.

Evaluative metering averages the entire frame including the bright background, which causes it to underexpose the darker foreground subject. Spot metering from the face ignores the bright background and calculates exposure from the subject's actual luminance, producing correctly exposed skin tones.

In manual mode, aperture, shutter speed, and ISO are fixed until the photographer changes them. Pointing the camera at a different part of the scene, as evaluative or center-weighted metering does automatically, cannot shift the exposure. This makes manual mode ideal when the light is consistent and the camera's position changes frequently.

In Aperture Priority you choose the aperture and ISO, and the camera picks the shutter speed for each shot. When light changes quickly, the exposure keeps up automatically while you keep control of depth of field. In Manual you would need to readjust settings every time the light changed.

A smaller aperture gives more depth of field but lets in less light. If ISO stays the same, the shutter must stay open longer to keep the same exposure. For example, going from f/4 to f/8 is two stops less light, so 1/250 second becomes 1/60 second.

A histogram is a graph of brightness in the image, from black on the left to white on the right. Data piled against either edge shows clipped shadows or highlights where detail is lost. It is more reliable than judging brightness on the rear screen, especially in bright light.