Topic: Lenses

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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Anti-Shake

What Is Anti-Shake and how Is it Used In Photography? In photography an anti-shake system compensates for unwanted movement of the camera which would otherwise blur a photograph whilst shooting, for example hand holding a camera whilst shooting in low light conditions. There are two main types of anti-shake system; Lens based anti-shake uses a moving optical element to counteract shaking. Camera based anti-shake uses a mechanism which allows the image sensor to move to compensate for unwanted movement. Anti-shake systems are also extremely popular with videographers who’s cameras do double duty as both a stills and video capture...

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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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Autofocus

What Is Autofocus? Autofocus (AF) is the feature of a camera that tries to ensure that your chosen subject is sharp within the photo.  Sensors detect how far away the subject is from the camera, and this information is relayed to the lens, which then uses an electronic motor to adjusts the focal distance of the lens.  Most point and shoot cameras are autofocus only, but all DSLRs and mirrorless cameras have the option to disable AF if desired. The first autofocus cameras were developed in the late 1970’s and their speed and accuracy has been improved greatly since that...

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Converter

What Does Converter Mean When Talking About Photography? A converter, also referred to as a tele-converter or extender is a secondary lens which can be mounted between a camera and main lens. The purpose of a converter is to magnify the central portion of a lenses image area, therefore increasing the focal length. Typically converters come in either 1.4 or 2.0 magnification factors. When using an extender the shooter will sacrifice a small amount of lens speed (-1 stop for 1.4 and -2 stops for 2.0) and autofocus performance will also reduce slightly. Extenders also magnify any distortion caused...

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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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Extender

What Is An Extender? An extender is the same thing as a teleconverter, it’s an optical accessory that sits between the lens and the camera and multiplies the focal length. One fact of note is that Canon call theirs ‘extenders’, whilst Nikon and other manufacturers call theirs ‘teleconverters’. This results in a split in terminology that you will find in books and all over the internet! Extenders can be a very cost-effective way to reach longer focal lengths that are typically useful for sports and wildlife photography.  Prices of longs lenses increase almost exponentially, but an extender can get you great...

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Filter Size

What Does Filter Size Mean In Photography? In photography filter size Refers to the inner diameter of the front of the lens, more specifically the threads into which a filter is screwed to attach it to the lens. Knowing the the filter size required for your lenses is extremely important as it will allow you to make sure you purchase the correct equipment, and also insure you can pack correctly for any photography outings you have planned. The filter size of a lens is always printed on the end of the lens barrel so that at a glance you...

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Filter Thread

What Is A Filter Thread? Almost all lenses have a threaded section on the front that allows you to screw on filters to achieve certain effects.  When referring to a lens’ specifications, it should tell you the diameter of the filter thread and then you can purchase your filters in the same diameter.  Common thread sizes include 52mm, 72mm, 77mm and 82mm.  If you have a filter that you would like to use with a lens that has a different filter thread diameter, this can be achieved with a step-down ring that adapts one diameter to another.  If you...

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