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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.

AF MODE: CONTINUOUS & AI SERVO vs. ONE SHOT
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
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.

Tamron AF 19-35mm f/3.5-4.5 Wide Angle Zoom Lens
Tamron's AF19-35mm F/3.5-4.5 is a affordable super wide-angle zoom ideal for travel, landscape, group portrait, adventure photography and more.

Nikon AF mount Edit
Kodak DCS 100 (back attached to a Nikon F3)
Kodak DCS 200 (back attached to a Nikon F801s/N8008s)
Kodak DCS 315 [back attached to Nikon Pronea 6i)
Kodak DCS 410 (back attached to a Nikon F90/N90) ...

Minolta AF[edit]
Konica Minolta AF DT 18-200mm f/3.5-6.3 (D) 13 groups / 15 elements, 1:4.2 magnification.
Nikkor[edit] ...

D-type AF Nikkor lenses (Only apply to Nikon)
AF Nikkor lenses that send Distance Information to some of Nikon's top cameras, Used for 3D Color Matrix Metering or 3D Multi Sensor Balanced Fill Flash (with Nikon SB 27/SB 26/SB 25 Speedlight).

The Nikon AF-S 24-70mm f/2.8G ED looks to be a nice incremental improvement over the already stellar Nikon 28-70mm AFS. Both seem to be around the same size and weight, but this new lens purports to have an improved optical design.

AF Area Selection Modes ...80
Displaying AF Points in Playback ...81
Tips on AF Points ...81
Controlling Depth of Field ...82
Using Deep Depth of Field ...83
Using Shallow Depth of Field ...84
Conveying the Feeling of Motion ...85 ...

AF Sensor - the sensor used to detect focus.
Aftertreatment - the treatment of negatives and prints to correct certain faults in exposure and development, or to create special effects.

- AF f/2.8 lens (36mm equivalent) with protective lens cover.
- LED "Flash" light.
- Up to 30-sec video clips with mono sound QCIF (176x144-pixel) resolution. Voice recorder.

Nikon AF-S DX Micro NIKKOR 40mm f/2.8G
Capture detailed close-ups with a 1:1 reproduction ratio
DxOMark
New tools for comparing cameras and lenses ...

A Nikon AF-S DX Micro Nikkor 40mm Close-Up Lens
A close-up lens is not really a lens in the normal sense of the word. They are usually sold as filters which screw onto the front of your lens.

Use your AF lock. If your subject doesn't fall under an autofocus point, select the AF point nearest to your subject, move the point over the subject, lock autofocus, and reframe.

Auto Area AF uses color information and special face recognition algorithms to automatically focus on an individual's face, which is extremely helpful when there's simply no time to select a focus point, ...

All modern AF systems are passive, ie. they don't send signals and use the echo to focus, but they only look at the light entering the camera through the lens.

Autofocus (AF) Camera system by which the camera lens or its body automatically focuses the image of a selected part of the picture subject. Most of modern cameras include the autofocus system. Jump to Top    Back to Previous Page ...

Autofocus (AF) System: A common system on SLR cameras where the camera lens automatically focuses the image using a selected part of the picture.

Autofocus (AF)
System by which the camera lens automatically focuses the image of a selected part of the picture subject.

-Wide area AF means the autofocus detection area is wider than normal. Making it easier to photograph moving subjects.
-Working aperture is the widest aperture at which an acceptable image can be achieved.

AE-lock and AF-lock
Some digital cameras have a powerful feature that lets you lock focus and exposure independently at the click of a lever.
Adjusting ISO ...

Auto-focus (AF). A camera setting that allows the camera to choose the correct focus distance for you, usually based on the contrast of an image (the image will be at maximum contrast when in sharp focus) or set by a mechanism, ...

Nikon’s AF technology continues to advance, now with a simple function that allows users to easily and effectively focus on moving subjects.
R&D Activities
Core Technology ...

Nikon's hybrid AF system is currently restricted to its Nikon 1 series of compact system cameras.
Canon is the best choice, for now.
SEE MORE: Master your camera's autofocus - which AF points to use and when to use them ...

Top of Page AF-I (Nikon)
Lens with built-in autofocus drive motor. CPU is also built in. AF-I Nikkor lenses send information on distance to the camera body and are classified as D-type AF Nikkor lenses.
Top of Page AI (Nikon) ...

Swivel and bounce heads allow the flash to bounce light off surrounding surfaces, such as the ceiling, to give a softer light.
AF Assist means that the flash is used in addition to the camera's own AF illumination, ...

Nikon SB-910 TTL AF Shoe Mount Speedlight, USA Warranty
Power2000 4 AA Nickel Metal Hydride (NiMH) 2900 mAH Rechargeable Batteries with 4- Hour AA & AAA
Connect with Mark Wallace on Facebook or Twitter, or visit the AdoramaTV channel on YouTube.

I select automatic AF point on my Canon Rebel. Am I better of selecting just one auto focus point and then recomposing as you describe ?
]] ...

8D AF Nikkor Lens - Nikons ‘nifty 50′ is a much loved lens and similar to the Canon version - for its price and quality it is a must have in your bag.
Nikon 18-200mm f/3.5-5.

Auto Focus: All Digital Cameras feature the Auto Focus (AF) function. In AF mode a Digital Camera automatically
Batteries: The power source for the camera's electronic features.

For example, in the nikon lens image we see letters AF-S while on Tokina (figure 3a) it's IF. Both of those symbols means the same- that the lens has internal auto focusing motor. Canon calls it USM after it's USM motor.

To tackle this problem, Nikon recently launched 2 lenses specially designed with digital cameras in mind: an AF DX Fisheye 10.5mm f/2.8 and an AF-S DX 1224mm f /4 G IF-ED zoom lens. That's what I should have used to get those award-winning shots! ...

That's two stops plus AF - a huge advantage for the Canon lens in practical field use.

AF lock
File size
Quick review
Menu
Monitor
This rugged housing is constructed of ABS and polycarbonate plastic for corrosion resistance and lightweight.

The kit lens that came with the D3000 package I tested is the AF-S Nikkor 18-55mm 1:3.5-5.6 VR. This is a pretty good lens to get you started out in photography. I found that it was sharp and clear in the short time I spent with this camera.

The other main option is continuous focus (displayed on the camera as "AF-C" for Nikon cameras and "AI Servo" for Canon cameras). This mode is used when the subject is moving. Suppose you're shooting a soccer player running toward you.

In addition, Canon's sixth generation processor, called Dual DIGIC 4, and a new AI Servo II AF focus tracking system insured I could quickly lock on to a moving subject and hold focus throughout the play.

The camera settings from EXIF as follows: aperture priority auto exposure, ISO 400, f8, one shot AF with central spot, partial metering,100-400 Canon @ 100mm.

There are three ways to focus: manual - in which we move the focus ring on the lens; AF single - the camera locks focus while we keep the shutter half pressed for us to recompose; AF continuous (or AI servo) - the camera never locks focus, ...

With focusing you have two choices, autofocus (AF) or manual focus.There are different types of autofocus systems but basically you either have it turned on or you don't.

6G AF-S DX VR Nikkor Zoom Lens
Canon Rebel XS 10.1MP Digital SLR Camera with EF-S 18-55mm f/3.5-5.6 IS Lens (Black)
Sony Alpha A230L 10.2 MP Digital SLR Camera with Super SteadyShot INSIDE Image Stabilization and 18-55mm Lens
or ...

Unless indicated otherwise, they were made in 2007 with a Nikon D70 with a 60mm AF Micro Nikkor lens. The second, third, and fourth photographs were taken in 2002 with an Olympus C-900 Zoom 1.3 megapixel digital point and shoot camera.

Available on some digital cameras, this AF option signals the camera to constantly focus on whatever object is in front of the lens. While some cameras perform better than others, continuous AF is helpful when photographing a moving subject.

8G ED AF DX Fisheye-Nikkor helped me take powerful shots in very cramped spaces during Katrina. This lens has a 180 degree angle of view so you have to use it skillfully. I also use the 14mm f/2.

He also used 60mm, 105mm and 200mm AF Micro-Nikkor lenses for creating high-magnification images in his "studio," which consisted of a black velvet background and two to four diffused electronic strobes.

Selective multi-area: Hold down the AF button and cycle through highlighted areas on the screen, to select the correct subject distance.
Metering Methods.
DSLRs provide a number of options to measure the light in a scene.

Nikon D2X/D2Xs - The Multi-CAM 2000 Autofocus (AF) sensor module
Learn what are the settings, why they work and suggested combinations
by Nikonian Darrell Young (DigitalDarrell) ...

Available-light situational photography is extremely demanding, both on equipment and on the photographer's skills. It's too dark for the AF to lock on properly, the metering to work, and, most importantly, ...

Use the custom controls to assign autofocus onto its own button. Hold down the AF button with your thumb to start focus tracking, keeping it held as you track your subject's movement, firing off a burst at the peak of the action.

5 frames-per-second
ISO sensitivity from 200 to 3200
Built-in image sensor cleaning via sensor shake
11-point AF system
In-Camera Image Editing
GPS Geotagging with additional GPS accessory unit
HD movie mode ...

You engage "single autofocus mode" by pressing the DSLR's shutter release button halfway down - when the subject is in focus you then press the button all the way to take the shot. If your camera has "continuous autofocus (AF) mode" it will try keep ...

This allows you to control when to AF or not and usually, the Shutter Release becomes an Exposure Lock button when pressed half way.

Geert on Pentax K-x and battery life
james on Pentax K-x and battery life
Gustau on Pentax K-x built in HDR test
Rufus Bradt on Pentax K-x and battery life
Flashes on K-x meet the AF-540FGZ ...

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

Photography  Aerial Photography  AF Assist Illuminator

 
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