Digital Photography: Capture, Lenses, and Shutter Mechanics

Vocabulary practice flashcards covering digital capture mechanics, camera sensors, lens optics, and shutter operation.

Digital Capture

The process of taking pictures with a digital camera, where light entering through the lens strikes an image sensor, is processed in-camera into an image file, and is saved to a memory card.

Pentaprism

A five-sided prism in a DSLR camera that, together with a reflex mirror, turns the upside-down and laterally reversed image formed by the lens right side up and correctly oriented for the optical viewfinder.

Photosite

A microscopic sensor on an image sensor grid that collects and stores light as electronic signals, converting those signals into numbers that represent light intensity and color to create a pixel.

Image Processor

A dedicated chip inside the camera linked to the sensor that converts captured sensor information into an image file, records metadata, and controls camera operations like burst rate.

Metadata

Information embedded directly within an image file that records operational details, including capture date and time, file format, resolution, exposure settings, camera model, and lens used.

Image Noise

The most common digital artifact, characterized by random grainlike and textured color specks, typically caused by shooting in low light, using high ISO settings, underexposure, or small sensors.

RAW

An information-rich, proprietary file format using lossless compression that retains all captured sensor data intact, providing maximum flexibility and quality adjustments in postproduction.

Bit Depth

Also called color depth, the measurement (in bits) that defines the amount of color information stored in an image file, determining the potential range and total number of colors possible.

Aperture

An adjustable opening inside a camera lens formed by overlapping blades that regulates the volume of light passing through to the image sensor.

F-stop

A numerical measurement of the relative size of a lens aperture, calculated by dividing the lens's focal length by the measured diameter of the aperture opening.

Focal Length

An optical measurement expressed in millimeters that represents the distance from the optical center of a lens to the image sensor when focused at infinity.

Angle of View

The extent of a scene that a lens can see and record, which is tied to image magnification and determined by both the lens focal length and the image sensor size.

Crop Factor

Also called the magnification factor or focal-length multiplier, the ratio used to calculate the equivalent focal length and angle of view of a smaller image sensor relative to a full-frame sensor.

Prime Lens

A camera lens with a single fixed focal length that does not zoom, typically offering wider maximum apertures, less bulk, and superior image sharpness compared to zoom lenses.

Depth of Field

The front-to-back zone of acceptable sharpness within an image, determined by the lens aperture, focusing distance, and focal length.

Macro Lens

A specialized lens capable of focusing extremely close to a subject—often just one to two inches away—while also retaining the ability to focus out to infinity.

Teleconverter

A tubelike accessory mounted between the camera body and the lens that increases the effective focal length of the lens (commonly by $1.4\times$ or $2\times$) while reducing the light transmitted.

Fisheye Lens

An extreme ultrawide lens providing an angle of view between $100^\circ$ and $180^\circ$, characterized by severe convex, curved distortion and sometimes a circular image frame.

Extension Tube

A hollow, optical-free accessory fitted between the camera body and lens that increases the distance between the lens and the sensor to enable closer focusing.

Focal-Plane Shutter

A mechanical shutter mechanism situated inside the camera body directly in front of the image sensor that controls exposure by opening and closing for a set period of time.

Shutter Speed

The duration of time that the camera shutter stays open during an exposure, controlling the amount of light reaching the sensor and determining whether motion is frozen or blurred.

Bulb (B) Setting

A camera exposure mode where the shutter remains open continuously for as long as the shutter release button remains fully depressed, closing only when the button is released.

Time Exposure

A prolonged shutter exposure duration commonly used in extremely dim lighting or to deliberately record movement as blur, usually requiring camera support on a tripod.

Camera Shake

Involuntary movement of the camera during exposure that causes the entire captured photograph to become blurry, occurring most frequently at shutter speeds of $1/30\,\text{second}$ or slower.

Panning

A technique of tracking a moving subject with the camera using a relatively slow shutter speed (such as $1/4$, $1/8$, or $1/15\,\text{second}$) to render the subject sharp against a blurred background.