Camera Types
DSLR Camera (Digital Single-Lens Reflex Camera): A camera that uses a mirror (reflex) mechanism to reflect light from the lens to an optical viewfinder. Characterized by directly viewing the subject through the lens.
Mirrorless Interchangeable-Lens Camera: A camera that does not use a mirror mechanism. Light from the lens directly hits the image sensor, and the image is displayed on an LCD monitor or electronic viewfinder. Often smaller and lighter than DSLRs.
Compact Digital Camera (Point-and-Shoot Camera): A general term for small digital cameras with a fixed lens that cannot be interchanged. Highly portable and suitable for everyday snapshots.
Interchangeable-Lens Camera: A general term for cameras that allow the user to change lenses according to the shooting purpose. DSLRs and mirrorless cameras fall into this category.
Fixed-Lens Camera: A type of camera where the lens is permanently attached to the body and cannot be changed. Compact digital cameras and smartphones are examples.
Waterproof Camera: A camera designed with water resistance, allowing it to be used for underwater photography.
Exposure Terms
Exposure: The overall brightness of a photograph, determined by a combination of three elements: shutter speed, aperture, and ISO sensitivity.
Shutter Speed: The duration for which the camera’s shutter remains open, allowing light to reach the sensor. Longer shutter speeds result in brighter images but can cause motion blur.
Aperture: A mechanism within the lens that controls the amount of light entering the camera. A larger aperture opening lets in more light, making the image brighter.
F-number (F-stop): A numerical representation of the aperture’s opening size. A smaller F-number indicates a larger aperture opening, resulting in a brighter image.
ISO Sensitivity: A numerical value representing the image sensor’s sensitivity to light. Increasing the ISO allows for brighter photos in low-light conditions but can introduce noise.
Exposure Compensation: The act of intentionally making a photo brighter or darker than the camera’s automatically determined “correct” exposure.
Correct Exposure: The camera’s automatically determined ideal brightness, neither too bright nor too dark.
Underexposure / Overexposure: “Underexposure” refers to a photo that is too dark compared to the correct exposure, while “overexposure” refers to one that is too bright.
Shutter Priority Mode (Tv/S Mode): A shooting mode where the photographer sets the shutter speed, and the camera automatically adjusts the aperture and ISO sensitivity.
Aperture Priority Mode (Av/A Mode): A shooting mode where the photographer sets the aperture, and the camera automatically adjusts the shutter speed and ISO sensitivity.
Focus Terms
Focus: The sharpest part of a photograph. Also referred to as “sharpness” or “in focus.”
Bokeh: A photographic effect where out-of-focus areas of an image are rendered as soft, pleasing blurs.
Out of Focus (Blur): An unintentional state where the entire photograph appears blurry due to incorrect focusing.
Depth of Field (DOF): The range of distance within a photograph that appears acceptably sharp. This range varies depending on aperture, focal length, and subject distance.
Autofocus (AF): A camera function that automatically adjusts the focus.
Manual Focus (MF): A method where the photographer manually adjusts the focus.
Focus Area: The specific region within the frame where the camera attempts to achieve focus. Modes include face detection or single-point focus.
Focus Mode: A setting that determines how the camera focuses, such as continuous focus for moving subjects or single-shot focus for stationary ones.
Minimum Focusing Distance: The shortest distance from the front of the lens to a subject at which the lens can still achieve focus.
Infinity Focus: A state where the subject is extremely far away, typically used for landscapes or astrophotography.
Composition & Photographic Expression Terms
Angle: The position from which the camera is held or the perspective (looking up or down) from which the subject is photographed.
Aspect Ratio: The ratio of the width to the height of a photograph.
Composition: The arrangement of elements within a photograph to create visual balance and impact.
Subject: The main element or focal point of a photograph that the photographer intends to convey.
Secondary Subject (Sub-subject): An additional element or subject that complements the main subject and enhances the overall message of the photograph.
Framing: The act of deciding what to include within the boundaries of the photograph and how to position the subject.
Position (Level): The relative height or viewpoint of the photographer in relation to the subject.
Rule of Thirds: A basic compositional guideline that involves dividing the image into nine equal parts by two horizontal and two vertical lines, placing key elements along these lines or their intersections.
Central Composition (Rule of Halves): A composition where the main subject is placed directly in the center of the frame.
Diagonal Composition: A composition that uses diagonal lines within the photograph to lead the viewer’s eye and create dynamism.
Leading Lines: A compositional technique that uses lines within the image to guide the viewer’s eye towards the main subject.
Lens Terms
Lens: An optical device attached to the camera body that collects light and forms an image on the image sensor.
Lens Mount: The interface connecting the camera body and the lens. Mount types vary by manufacturer.
Focal Length: The distance in millimeters (mm) from the optical center of the lens to the image sensor when the lens is focused at infinity. It is directly related to the angle of view.
Angle of View: The extent of the scene that is captured by the lens and appears in the photograph. It changes with focal length.
Wide-Angle Lens: A lens with a short focal length that captures a broad field of view.
Telephoto Lens: A lens with a long focal length that magnifies distant subjects.
Zoom Lens: A lens with a variable focal length.
Prime Lens (Fixed-Focal Length Lens): A lens with a fixed focal length that cannot be changed.
Full-Frame Equivalent: A measurement used to express the focal length that would produce the same angle of view on a full-frame sensor as a given lens on a different sensor size.
Distortion (Barrel/Pincushion Distortion): An optical aberration where straight lines appear curved in a photograph due to lens characteristics.
Vignetting (Peripheral Light Falloff): A phenomenon where the edges or corners of a photograph appear darker than the center.
Ghosting / Flare: Phenomena where light reflections within the lens cause circular or linear streaks of light to appear in the photograph, often when shooting towards a bright light source.
Filter Thread Diameter: The diameter of the screw thread at the front of the lens, used for attaching filters.
Vignetting (Mechanical Vignetting): A phenomenon where a lens hood or filter obstructs the view and appears in the corners of the frame.
Sensor & Image Quality Terms
Image Sensor: The component inside a digital camera that receives light from the lens and converts it into electrical signals to form an image.
Pixel: The smallest unit of information that records color and brightness in a photograph. A higher number of pixels generally results in a more detailed image.
Full-Frame Sensor: An image sensor size equivalent to a 35mm film frame (approx. 36x24mm). Generally associated with higher image quality.
APS-C Sensor: An image sensor size smaller than full-frame.
Tone: The overall brightness and color balance of a photograph.
Gradation: The smoothness of the transition between different brightness levels or colors in a photograph.
Highlight / Shadow: “Highlight” refers to the brightest areas in a photograph, while “shadow” refers to the darkest areas.
Contrast: The difference in brightness between the brightest and darkest parts of a photograph.
Blown Out Highlights / Crushed Blacks: “Blown out highlights” refers to overexposed areas where detail is lost and appears pure white. “Crushed blacks” refers to underexposed areas where detail is lost and appears pure black.
Dynamic Range: The range of light intensities, from the darkest to the brightest, that a camera sensor can capture in a single exposure.
High ISO: Setting a high ISO sensitivity for shooting, useful in low-light conditions.
Noise: Random graininess or speckles that appear in a photograph, typically more noticeable at high ISO sensitivities.
Light Terms
White Balance (WB): A camera setting that adjusts the color balance of a photograph to ensure that white objects appear truly white, regardless of the color of the light source.
Color Temperature: The color of light, expressed in Kelvin (K). Lower Kelvin values indicate warmer, reddish light, while higher values indicate cooler, bluish light.
Color Cast: A phenomenon where the entire photograph takes on a tint of a particular color due to the dominant color of the light source.
Backlight: A lighting condition where the main light source is behind the subject.
Front Light: A lighting condition where the main light source is in front of the subject.
Side Light: A lighting condition where the main light source illuminates the subject from the side.
Semi-Backlight: A lighting condition where the main light source is positioned diagonally behind the subject.
Blur & Shake Terms
Subject Blur (Motion Blur): Blurriness in a photograph caused by movement of the subject during a slow shutter speed.
Camera Shake (Handheld Shake): Blurriness in a photograph caused by the movement of the photographer’s hand during a slow shutter speed.
Image Stabilization (IS / VR / OS / O.I.S.): A function that reduces blur caused by camera shake. It can be built into the lens or the camera body.
Slow Shutter Speed: Using a slow shutter speed for photography, often to create effects like silky smooth water or light trails.
Fast Shutter Speed: Using a fast shutter speed for photography, often to freeze fast-moving subjects like birds in flight.
Editing & Post-Processing Terms
JPEG: A common file format for digital photos. It is a compressed format, resulting in smaller file sizes.
RAW: A file format for digital photos that records all the image data captured by the camera’s sensor without compression. It offers greater flexibility for post-processing.
RAW Processing: The process of editing and converting RAW data into other formats like JPEG.
Retouching: The act of making selective adjustments to color, brightness, shape, or other aspects of a photograph.
Print: The process of producing a hard copy of a digital photograph on paper.
Other Terms
Viewfinder: A window through which the photographer looks to compose and focus the image.
Optical Viewfinder (OVF): A type of viewfinder found in DSLRs that allows the photographer to see directly through the lens using mirrors and prisms.
Electronic Viewfinder (EVF): A type of viewfinder found in mirrorless cameras that displays a digital image from the camera’s sensor on a small screen.
Diopter Adjustment: A control on the viewfinder that allows adjustment for the photographer’s eyesight to ensure a clear view.
Level: A feature (often digital) that helps ensure the camera is perfectly horizontal.
Tripod: A three-legged stand used to stabilize the camera and prevent camera shake, especially during long exposures.
Flash (Strobe): A device attached to the camera that emits a sudden burst of light to illuminate subjects in low-light conditions.
SD Card (Secure Digital Card): A type of memory card used to store digital photographs in cameras.
Battery: A rechargeable power source for the camera.
Charger: A device used to recharge camera batteries.