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Photography  Aerial Photography  AF Assist Illuminator
04/23/2014

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 ...

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 - 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 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 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
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 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.

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 ...

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.

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.

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

-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.

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) ...

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

Photography  Aerial Photography  AF Assist Illuminator
04/23/2014

 
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