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 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
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The Auto Focus (AF) System in a camera found in the 1980′s is an important discovery in the world of photography and has had a major impact in bringing convenience to photographers.
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 ...
Center AF
Most digital cameras use contrast detection to auto focus (AF).
Autofocus (AF)
Autofocus refers to a camera's ability to automatically adjust and focus its lens on a framed image.
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-S: Autofocus Silent Focusing is driven by a "Silent Wave" motor in the lens instead of the focus drive motor in the camera. AF-S lenses focus faster than standard AF-NIKKORs and almost completely silently. Find out more.
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 MODE
A function used to switch between the camera's auto focus modes. The camera has two AF modes. [iESP] detects the subjects in the entire picture, determines the primary subject and decides on the focusing point.
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 Micro adjustment Tutorial
Focusing systems in modern DSLRs have been long criticized for accuracy problems. Phenomenon seems to be persistent across different brands.
AF sensor:
The sensor used to detect and help correct the focus in cameras equipped with an autofocus function.
algorithm: ...
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 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-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.
-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.
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.
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) ...
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
Auto focus; the almost universal system whereby the camera detects the subject distance and focuses the lens. Not all AF systems are equal! Some are much faster and/or more accurate than others; some perform well in low light, some don't.
AF - Abbreviation for auto focus.
AF Assist - Auto Focus Assist - Refers to a feature built into either a camera or an accessory flash unit. It allows auto-focusing under dim lighting conditions.
AF lock:
Stops autofocus operation once the subject is in focus. Useful when shooting a subject outside the focus area in the viewfinder.
Affirmative: ...
AF (Autofocus) Lock
Used to prevent autofocus operation once the subject is in focus. This gives you more creative control by allowing you to focus, compose your image, and then capture the image.
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 ...
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 ...
Nikon AF Nikkor 50mm full frame Prime lens
Nikon AF Nikkor 18-70mm (APS-C) Zoom lens
Main articles: Photographic lens and Lenses for SLR and DSLR cameras ...
Metz 48 AF-1 flash (replaced by the 50 AF-1; $230, street.)
Enlarge
Tamron 90mm f/2.8 Macro ($460, street) ...
AI Servo AF is an auto-focus mode that continuously focuses on a subject -one that is moving -- until you find that decisive moment to snap the picture.
8 AF Nikkor
50mm 1.8D AF Nikkor
As I hope to have shown, there is no need to complicate flash photography ourselves. Nikon has made it real easy for us to turn out well lit images, without the "deer under the highlights" look.
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.
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.
Tracking AF
The FinePix F80EXR's new Tracking AF function means that users can track a moving subject whilst ensuring focus is maintained, even when using the full 10x zoom.
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 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 ...
I turn off my AF-assist light (A9 on my D300)
I turn my flash-sync speed to 1/320th (E1)
My dynamic auto-focus area is on 51 points (A3).
My LCD illumination is turned on (D8) ...
Helpfully, the AF points are placed on (invisible) vertical and horizontal lines at points one-third into the frame, so they can also help with composition when it comes to the rule of thirds - use them as guides for placing the subject in the frame.
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 ?
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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.
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) ...
Autofocus (AF) System: A common system on SLR cameras where the camera lens automatically focuses the image using a selected part of the picture.
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.
 See also: Camera, Image, Focus, Lens, Photograph
  
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