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. By default on most cameras when pushed half way down the shutter release button, the button used to take a picture, sets both focus and exposure.
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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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 glass or in crowded locations.
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Nikon AF-S 50mm f1.4G review
The Nikkor AF-S 50mm f1.4G was announced in September 2008 as the company’s flagship standard prime lens. It shares the same bright f1.4 aperture and standard focal length as the much older AF 50mm f1.
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
Closest Focusing Distance: 1 ft. (0.3 m) ...
Multi-Point AF works pretty well usually but sometimes the camera will focus on something else besides your main subject if that something else happens to fall under one of the AF points and is also more contrasty than your main subject.
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-S DX Zoom-Nikkor 18-135mm f/3.5-5.6G IF-ED Major Features
Offers the broad 18-135mm focal range (7.5x zoom) for use in a wide variety of situations (equivalent to a 27-202.5mm lens in the 35mm format) ...
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. On more expensive models, this tends to be deep read and send out a pattern of vertical bars in the near infrared range that the AF sensor is well attuned to.
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. Now that is a lot of glass! ...
AF - Auto Focus. A system that automatically focuses the camera lens.
Algorithm - A mathematical routine that solves a problem or equation. In imaging, the term is usually used to describe the set of routines that make up a compression or colour management program.
Frankly, I've never been much of a fan of any type of focus lock for general purpose shooting. It's just too slow.
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.
Autofocus lock. You can prefocus at a distance, which is then kept regardless of subject movement.
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 ...
Yes, covers all focus points in EOS cameras up to 9 AF points ...
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
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.
We bought this lens for Dani, so she would not have to change lenses anymore. I was skeptic about the quality of a lens with such a large zoom range, but I was positively surprised.
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. Offering an authentic super wide-angle range with an angle of view of 97°- 63° and a close M.O.D. of 19.
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)
Kodak DCS 420 (back attached to a Nikon F90/N90 or F90X/N90s) ...
Konica Minolta AF DT 18-200mm f/3.5-6.3 (D) 13 groups / 15 elements, 1:4.2 magnification.
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.
Set. The camera will continuously focus when the button is pressed half way and you should have a correctly focused photo! ...
Select one of three autofocus modes: one-shot (static subjects), AI Focus (switches automatically from one shot to AI Servo) and AI Servo (for moving subjects).
- 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.
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.
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. The AI in the title refers to 'artificial intelligence' and the camera's computer makes a prediction on where the subject will be.
AE Lock ...
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. Keep in mind, however, that locking the autofocus also locks the auto-exposure.
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, or when using Live View in hand-held mode at high or low angles.
All modern AF systems are passive, i. e. 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) System: A common system on SLR cameras where the camera lens automatically focuses the image using a selected part of the picture.
System by which the camera lens automatically focuses the image of a selected part of the picture subject.
A camera with a built-in exposure meter that automatically adjusts the lens opening, shutter speed, or both for proper exposure.
-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.
-Working solution is a liquid chemical that has been mixed and diluted for use.
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, such as an infrared sensor, ...
Nikon’s AF technology continues to advance, now with a simple function that allows users to easily and effectively focus on moving subjects.
Precision Measurement and Manufacturing
Software and Systems ...
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) ...
The changes in AF technology are moving two different types of cameras toward one destination: a high-speed, mirrorless world. Compact mirrorless cameras are marching steadily toward full-frame performance and features while full-frame cameras are moving toward a mirrorless design.
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.
About The Author ...
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.
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! I f ully blame the equipment! ...
That's two stops plus AF - a huge advantage for the Canon lens in practical field use.
* AF micro adjustment (up to 20 lenses individually)
* Three custom modes on command dial, Creative Auto mode
* Image copyright metadata support
* 98% coverage viewfinder (0.71x magnification)
* 3.0″ 920,000 dot LCD monitor with ‘Clear View' cover / coatings, 170° viewing angle ...
This rugged housing is constructed of ABS and polycarbonate plastic for corrosion resistance and lightweight. Designed with flexibility in mind the housing will accept all of the current line of conversion lenses for the MMIII camera.
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. After the first photo experience shown above I figured partial metering mode would be safe - WRONG - read the manual.
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, this setup is good for objects in motion.
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. Although autofocus is pretty standard on new 35mm/APS cameras these days not having this feature isn't really a drawback.
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
Panasonic Lumix DMC-G2 12.
For example, a dome port on an ultra wide angle lens, such as the Tokina AF 10-17mm, corrects distortion caused by the lens. Another good point of discussion is the difficulty of changing lenses in underwater photography. DSLR users have to decide which lens they want to use before going underwater.
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. Many thanks to Q.
Digital SLR Camera Reviews: Nikon D5100 16.2MP CMOS Digital SLR Camera with 18-55mm f/3.5-5.6 AF-S DX VR Nikkor Zoom Lens Not rated yet
Digital SLR Camera Reviews: Nikon D5100 16.2MP CMOS Digital SLR Camera with 18-55mm f/3.5-5.6 AF-S DX VR Nikkor Zoom Lens The Nikon D5100 … ...
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/2.8D Nikkor ultra-wide angle rectilinear lens, which produces nice even horizon lines without distortion.
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.
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) ...
Sports Mode - Designed for shooting moving subjects, the centre AF point is enabled, continuous shooting is also enabled, and the camera will try to achieve as fast a shutter speed as possible.
How to Get "Tack Sharp" Photo Images - Part III: ISO, Focus Lock, AF Focus Mode, Manual Focus and Mirror Lock-up
Learn the camera's focusing features.
By Brad Sharp ...
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.
12.3-megapixel DX-format CMOS imaging sensor
Continuous shooting at 4.5 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 the subject in focus without you having to press ...
This allows you to control when to AF or not and usually, the Shutter Release becomes an Exposure Lock button when pressed half way. You can focus on one subject yet meter for another, a great feature that more and more companies are copying from Canon.
While it is normal that cameras gives you a noise in dark areas of the image, this one has almost none and it can pull more details from shadows than most of the other cameras.
The picture quality is simply amazing. This camera can focus in very low light thanks to the AF Light Emiter.
See also: Camera, Photograph, Photography, Image, Light