In buying a new lens for an individual's camera, you will keep being seen the terms "EF" and "AF" from the product descriptions. It's a standard misconception that these two acronyms mention different things, as you'll often obtain them both available in exactly the same lens. EF stands for Electro-Focus which is a proprietary lens-mounting technologies, whereas AF simply is a symbol of Auto-Focus.
History
Since 1987, cameras manufactured via the multinational imaging and optical equipment company Canon Inc. have exploited a lens mounting system also known as "EF, " or Electro-Focus. This proprietary system was a advancement in camera technology out of your FD mount, its forerunners, which used mechanical connections between your camera body and standard zoom lens for controlling the optics (focus, aperture).
The EF mount does not have any such mechanical connections and instead depends on electrical impulses transferred belonging to the camera body to power motors built within the lenses themselves. This new mounting technique ushered in Canon's EOS (Electro-Optical System) category of cameras and allowed the corporate to further develop the AF, or auto-focus, methods.
With lens mechanisms do not dependent upon the camera body these people were attached to, auto-focus enhancements came quickly. Since the focusing motors moved in the lenses, they could be refined for work more efficiently and precisely---custom designed to each specific model---and just weren't subject to the mechanical deterioration with their connectors over time.
Features
Almost most of EF lenses feature split zoom and focus sounds, as well as some distance/scale window for featuring the focus distance. In addition feature quick and legitimate auto-focus capabilities, with higher-end camera bodies allowing for 41 distinct areas with multi-point focus.
Image Stabilization is mostly a related technology available in the majority of the EF lenses, which makes subtle optical adjustments to the fly to compensate for your minor jitters and shakes out of hand-held shooting.
EF lenses is usually equipped with front-threaded filtration system, and many models at the same time offer support for central drop-in filters and rear-mounted gelatin owners.
The larger EF lenses also include a tripod mount and website hood mount for more reliable shooting.
To facilitate quickly attaching EF lenses for your camera, each lens is marked using a distinctive attachment marking close back end that assists position the lens properly for hitting the ground with the camera body.
Types plus Identification
The EF lens family has grew to include two sorts, and many individual versions, including prime (a one-time focal length) and typical zoom lenses (multiple focal lengths).
The first type certainly is the standard EF specification which might be easily identified by the country's attachment marking, which would appear that a round red indicate on these original improved lenses.
The second type is often a variant called the EF-S (for "Short back focus") which has been introduced in 2003. EF-S lenses include a shorter distance between the completed of the lens plus the image sensor, which provides smaller lens enclosures not to mention lighter lenses. The technology is particularly suitable for wide-angle shooting and should be only mountable on cameras that support the device; older cameras that support only the product quality EF lens mount is not able to utilize EF-S lenses because for mechanical incompatibilities.
The simplest way to identify an EF-S lens is just as before by its attachment observing, which is shaped as a white square on such models.
Benefits
The EF in addition to EF-S lens series are probably the industry's finest, and the premium "L" (for "Luxury") to line of EF lenses represents typically the pinnacle of Canon's optics know-how. These lenses are straight away recognizable by their vivid white and red colors.
In simple terms, all EF contacts are durable and adaptable, allowing for excellent quality shooting in any type of conditions.
Additionally, the Image Stabilization system on most EF lenses may be for hand-held photography since it corrects high of the blurriness and other optical deterioration that might occur because of volatile shooting conditions.
Considerations
So even while AF (auto-focus) technology is obtainable on nearly every video camera and lens system that can be purchased, the EF acronym refers specifically to the proprietary mounting system expressed by Canon, and therefore the contacts and their benefits are simply designed for Canon eos cameras, although adapters do exist to permit certain lenses to be taken on other cameras.
As with 2010, the EF plus EF-S lens families differ in price from about $500 USD to more than $10, 000 USD different, and represent a corresponding collection of quality from entry-level in the absolute top-of-the-line professional grade.
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