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AF Assist Lamp
By Vincent Bockaert
Some manufacturers fit their cameras with a lamp (normally located beside or above the lens barrel) which illuminates the subject you are focusing on when shooting in low light conditions.

AF-ON (Auto Focus On)
Written by: Steve Guymon
This button is also used to activate automatic focusing.

AF illuminator
An infrared or bright light beam that fires from the camera to the subject to determine camera to subject distance or to assist autofocusing in low light, can though be fooled if shooting through glass
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AF (Autofocus) Assist Illuminator
From Nikonians Wiki - FAQs, Photo Glossary, Good Photo Locations, Help
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AF-A is where the camera selects and goes between the last two modes. If it thinks the subject you are photographing is stationary, then it will automatically use AF-S focus mode.

AF lock (AF-L)
A mode to lock the focus to a predetermined point. Useful when the subject is moving fast because you can take the photo as it reaches a certain point or when other influences could affect the focusing such as shooting through ...

Nikon AF-S DX NIKKOR 35mm f/1.8G Autofocus Lens Specifications
Focal length: 35mm
Maximum Aperture: f/1.8
Minimum Aperture: f/22
Lens Construction: 8 elements in 6 groups (with one hybrid aspherical lens)
Picture Angle: 44 degrees ...

Center AF
Most digital cameras use contrast detection to auto focus (AF).

AF (Autofocus) Lock Used to prevent autofocus operation once the subject is in focus. AF Sensor The sensor used to detect focus in cameras equipped with autofocus operation. APS Advanced Photo System.

AF on Demand
Both Canon and Nikon offer custom functions that allow you to decouple AF from the shutter. Once the custom function is activated you need to depress a separate "AF-ON" button to start to auto-focus.

AF-coupled Multi-Sensor TTL Flash Metering
AF coupled metering goes one step further. Instead of relying purely on the metering pattern the selected AF sensor(s) is also taken into account. So if your camera has e.g.

AF - Abbreviation for 'Autofocus'
AF LOCK - Autofocus Lock - Causes the camera to stop automatically focusing. AF lock is typically used when the subject is outside of the viewfinder's autofocus sensor(s).

AF Area Selection
The AF area you select with the control on the camera back is the first one the camera uses each time you half press the shutter.

AF-Abbreviation for auto focus.
AF assist-See auto focus assist.
afocal lens-A lens accessory that maintains the distance between the camera and camera subject while modifying the focus distance.

AF Micro adjustment Tutorial
Focusing systems in modern DSLRs have been long criticized for accuracy problems. Phenomenon seems to be persistent across different brands.

AF Aid Light
Autofocus has limitations in low light, so a lot of AF cameras include an autofocus aid light.

AF - Abbreviation for 'Autofocus'
Ambient light - The natural light in a scene.
Archival - The ability of a material, including some printing papers and compact discs, to last for many years.

AF-S NIKKOR 24-85mm f/3.5-4.5G ED VR lens.
Also, Nikon announced that total production of NIKKOR lenses for Nikon SLR cameras and Nikon 1 advanced cameras with interchangeable-lenses reached seventy million last month.

AF - Auto Focus. A system that automatically focuses the camera lens.

AF. Auto Focus. All digicams and most modern SLR lenses have this function now. The lens automatically focuses on the subject as quick as the eye. The only difference is that with an SLR you can normally select manual focus if necessary.

AF lock
Autofocus lock. You can prefocus at a distance, which is then kept regardless of subject movement.
AF ...

AF Focus Point Test
To test just how good (or bad) auto focus is for close ups, I decided to conduct a simple test using the Hibiscus Stamen, pictured below, as the subject.

The most widely supported camera focus mode is one-shot focusing, which is best for still subjects.

AF-I & AF-S lenses
Nikon's new series of AF lenses, involves the intergration of coreless motors into their super telephoto lenses. This gives these lenses quick, ultra quiet autofocus operations.

AF NIKKOR 50mm f/1.8D
The Nikon users out there definitely have an excellent answer to the Canon 50mm f/1.8 in the Nikkor equivalent.

AF assist light.
It's very hard for cameras based on passive autofocus mechanisms (this includes all EOS cameras except the manual-focus EF-M) to focus when it's dark, since they rely on contrast between light and dark areas.

AF point selection
Normally centre point, with alternatives selected for improved composition
Drive mode ...

AF-assist Beam:
Yes, covers all focus points in EOS cameras up to 9 AF points ...

AF Servo
A.k.a. Continuous Focus, AF Servo, is maintained by partially pressing the camera's shutter release button, which enables you to maintain focus on a moving subject as the subject moves within the frame.

Nikon AF-S TC-14E II 1.4x
Contact nikon.co.uk
Optical construction 5 elements/5 groups
Focusing AF and/or manual, depends on the master lens
Lens compatibility Range of Nikon AF-S telephotos/zooms
Mounts available Nikon
Weight 200g ...

Sigma AF 18-200mm f/3.5-6.3 DC OS - Superior Superzoom
best universal lensThis is a Digital Lens.

Active AF (autofocus): In Active AF the camera sends out a beam of something (usually infrared light) and times how long it takes to return.

Use AE/AF lock
How many times have you attempted to focus on your subject only to have the the lens tease you by immediately losing focus or losing focus while you're busy perfecting your composition.

See also: See also: Camera, Photograph, Photography, Image, Light

Photography  Aerial Photography  AF Assist Illuminator

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