Topic: Acronyms

AF

What does it mean when a camera or lens has the letters AF on the side of it? Click through to find out in our photography dictionary.

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AL

What Does AL Mean In Photography? AL is an abbreviation of Aspherical Lens and is often used by the manufacturer, Pentax.  Please see the aspherical lens definition page for more details.   Additional Reading What Is An Aspherical Lens? What Does DO Mean On A Canon Lens? Pentax Lens Terminology And Abbreviations...

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ASP

ASP Lens Definition ASP is an abbreviation for Aspherical Lens and is used by the manufacturer Sigma, to denote lenses which contain an aspherical lens element.  Please see the aspherical lens definition page for more details on this optical type.   Additional Reading What Is An Aspherical Lens?   Sigma 14mm f/2.8...

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ASPH

ASPH Lens Definition ASPH is an abbreviation of Aspherical Lens and is used by the manufacturer, Leica to denote lenses which contain an aspherical lens element.  Please see the aspherical lens definition page for more details on this optical type.   Additional Reading What Is An Aspherical Lens? What Is An Apochromatic Lens? Leica Lens Terminology And Abbreviations    Leica Summilux 35mm...

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CN-E

What Is A Canon CN-E Lens? When Canon launched the Cinema EOS camera line for professional video applications, they needed a lens lineup to compliment the cameras.  Cinema lens are designed quite differently to stills camera lenses, so the Canon CN-E lens lineup was born to cater to that market.  Canon’s CN-E prime lenses are available with an EF mount, whilst the CN-E zoom lenses are available in either EF or PL mount.  The biggest visual difference between EF and CN-E lenses, is that the cinema lenses have gearing around them that allows the focus and aperture to be easily...

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DAM

What Does DAM Mean? DAM stands for Digital Asset Management and in relation to photography, it describes everything we do with our image files from the moment we begin to download them from the memory card or camera. DAM encompasses: What file format we choose to store images in Where we store our images How we back up our images How we ingest the images from the memory card How we append metadata to our images, like keywords and scene descriptions What software we use to manage our images and metadata How we decide to distribute our images File...

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DO

What Is A DO Lens? The DO lettering seen on some Canon lenses stands for Diffractive Optics.  You can spot a DO lens by the bright green ring around the front of the lens barrel, in a similar way to the red rings seen around Canon’s L-Series lenses.  All lenses consists of a number of smaller glass elements within the lens barrel and Diffractive Optics is a technology that allows them to use considerably less optical elements in a lens design.  They do this by bending the light much more with DO lens elements than they typically do with...

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EF-M

What Is An EF-M Lens? With the launch of the Canon EOS M mirrorless system in 2013, came the EF-M mount.  A mount that allowed Canon engineers to create a smaller line of lenses that complimented the smaller body size of the EOS M series.  There is also an EF to EF-M adapter which allows you to use EF or EF-S lenses on an EF-M mount camera, and still maintain full electronic control and autofocus.  The rollout of lenses for the EF-M mount has been the slowest in Canon’s history though and choices are relatively limited.   Most popular...

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EF-S

What Is A Canon EF-S Lens? EF-S lenses are designed specifically for Canon APS-C sensor cameras.  It is not possible to mount an EF-S lens on an APS-H, or a full frame camera. Since crop sensor cameras do not make use of the full width of full frame lenses, you end up carrying around a lot more lens than is really necessary! EF-S lenses are lighter and smaller, because they don’t need to cover such a large image circle. Most popular EF-S lenses: Canon EF-S 24mm f/2.8 STM Pancake | Canon EF-S 10-22 f/3.5-4.5 | Canon EF-S 10-18mm f/4.5-5.6 IS STM   Additional...

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EOS

What Is An EOS Camera? EOS stands for Electro-Optical System and it was introduced in 1987 by Canon to unveil their line of autofocus SLR cameras with the new EF Mount lens range.  Of course today, this name has stuck, and it now encompasses their DSLR lineup as well.  The first EOS camera was the Canon EOS 650 35mm film camera, and this was followed in 2000 with Canon’s first DSLR, the Canon EOS D30.  These days the EOS lineup has expanded to include the EOS-M Mirrorless system, as well as the Cinema EOS system for professional videography and...

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