The world of photography is full of terms and phrases that can be confusing for new photographers, so PetaPixel has put together a complete glossary of everything you may want to know the meaning of if you’re just getting started.
A
Active Autofocus. An autofocus system in which the camera emits a red beam that bounces off the subject, returns to the camera, and is detected in order to determine the distance from the camera to the subject. The camera then uses this reading to precisely adjust focus and lock it onto the subject.
Adobe. An American software company based in San Jose, California. Many of its flagship products, including the image editing software Adobe Photoshop, are widely used by photographers, videographers, and creatives across a wide range of industries.
Adobe Camera Raw. Also known as ACR, it is an Adobe Photoshop plug-in that lets you import, process, and enhance raw photographs without going through Adobe Lightroom.
AE Lock. Autoexposure lock is a camera function that allows the users to lock the current exposure settings. This enables the photographer to shoot photos without the camera recalculating the necessary settings for optimal exposure before every shot.
AF Lock. Autofocus lock is a camera feature that allows a photographer to freeze the current focus point of the lens, enabling them to shoot a photo at any time independent of whether the camera determines it has achieved correct focus.
Ambient Light. Any light in a scene that the photographer did not introduce artificially. This can include both natural light from the Sun as well as artificial light already illuminating a location.
Angle of View (AOV). Another term for field of view.
Aperture. The opening of the diaphragm within a lens that light passes through on its way into a camera. This is one of the fundamental settings for controlling exposure and a component of the Exposure Triangle. Usually measured and expressed as a number known as the f-number of f-stop.
Aperture Priority. A camera exposure mode in which the photographer sets the aperture and the camera automatically sets the shutter speed in order to achieve optimal exposure based on lighting conditions detected by the built-in light meter.
APEX. Short for Additive System of Photographic Exposure. A system for simple exposure computation first proposed in the 1960 ASA standard regarding monochrome film speed. While APEX failed to become a fundamental standard in the camera industry, its use of Av and Tv to refer to aperture and shutter speed live on in modern cameras.
APS-C. Advanced Photo System type-C is a format for digital image sensors that is roughly the same dimensions as the Advanced Photo System (APS) film negative in its Classic (C) format. It measures 25.1×16.7mm with an aspect ratio of 3:2. Commonly found in digital cameras, the format is smaller than standard 35mm film, so it is known as a “cropped frame” sensor, usually with a crop factor of 1.5x or 1.6x.
APS-H. Advanced Photo System type-H is a format for digital sensors that is based on the dimensions of Advanced Photo System (APS) film negative in its High Definition (H) format. It measures 30.2×16.7mm with an aspect ratio of 16:9. Not commonly found in modern digital cameras, APS-H has a crop factor of about 1.25x or 1.3x compared to standard 35mm film.
Archival. The quality and ability of a photo to remain unchanged in appearance for an extended period of time. Can refer to data storage technologies for digital images or paper, ink, and storage qualities for photographic prints.
ASA. Short for American Standards Association. The standards body that defined the ASA system for rating the speed sensitivity of photographic emulsions. The private non-profit organization has since been renamed to American National Standards Institute (ANSI). In 1974, ASA and DIN were combined into the ISO standards used by photographers today.
Aspect Ratio. The ratio of an image’s width compared to its height. Typically expressed as the two numbers separated by a colon. Common aspect ratios found in film and digital photography include 4:3, 3:2, 16:9, 5:3, 5:4, and 1:1.
Aspherical Lens. A type of optical lens in which the surface curves are not portions of a sphere. Compared to a traditional non-aspheric lens, the more complex shape of aspherical lenses allows light rays to more precisely converge onto a single focal point, reducing various types of optical aberrations. Typically found in higher-end camera lenses geared toward professional photographers.
Astrophotography. Astronomical photography has to do with shooting photos of the night sky or anything found within it, including space objects and events. Advancements in camera, computing, and telescopic technologies and the accompanying reduction in prices have opened the door to astronomical photos that were impossible just years ago, leading to an explosion in highly-detailed space photos from amateur astronomers and photographers.
Autofocus. A system in a camera that automatically focuses a lens on a selected point or area within a scene. Achieved actively (e.g. with sound or light), passively (e.g. with phase or contract detection), or in a hybrid way through a variety of means, but generally involving a sensor, controller, and motor.
選擇“Disable on www.wenxuecity.com”
選擇“don't run on pages on this domain”
