Talk:Autofocus

message: I presume that the cameras (still and camcorders etc) which use infra-red light to autofocus must have an IR LED to provide the illumination? I ask because I am trying to estimate the market for such components. Given the number of DSCs and camcorders sold this must be a substantial market for IR LEDs.
Meanwhile, other types of LEDs are being used. For example:
Avago Technologies has introduced a high-brightness green auto focus auxiliary flash light emitting diode (LED) to assist the auto focusing function in digital still cameras when used in low ambient light conditions. The ASMT-FG10 flash LED offers a small footprint, measuring 4.8 x 4.8 x 5.33 mm.
Touted as a low-cost alternative to conventional infrared (IR) auxiliary auto focus solutions, the ASMT-FG10 compact green LED lamp is said to provide the highest brightness and smallest package in the industry. The narrow angle SMT lamp package is suitable for digital cameras that require long distance illumination and a narrow beam pattern. Digital still cameras have twice the sensitivity when responding to the color green than other colors, due to the availability of more photo diodes allocated for green in each pixel, said the company.
The ASMT-FG10 green (530nm) Indium Gallium Nitride (InGaN) dome LED lamp uses an un-tinted, non-diffused lens to provide high luminous intensity within a narrow radiation pattern. It incorporates an encapsulated LED chip on an axial leadframe to form a molded epoxy lamp package with six bended leads for surface mounting. The InGaN material has a very high luminous efficiency and is capable of producing high light output over a wide range of drive currents, said the company.
The easy to install ASMT-FG10 also simplifies the assembly process, which is said to result in a cost savings and better overall performance of the camera. It also features a six-degree viewing angle and is compatible with 2x solder reflow process. It meets IEC/EN 60825-1 Eye Safety Class 1 requirement. The device is RoHS compliant. Click the link for more information about the ASMT-FG10 LED.
The ASMT-FG10 SMT LEDs are priced at $0.60 in quantities of 10,000. They are supplied in 16-mm tape on 380-mm (15-inch) diameter reels for compatibility with automated manufacturing. Samples and production quantities are available now.
Avago Technologies, 1-800-235-0312, www.avagotech.com/led 
Earlier this US company had released another type of visible LED:
AlInGaP-based orange 612nm LED specifically designed to provide the illumination required to operate the automatic focus function of a digital still camera under low-light conditions. Most cameras use an infrared LED for this function, although some already use visible devices.
http://www.ledsmagazine.com/news/2/11/13
RadioShack has a high power IR LED which it says is suitable for AF:
http://www.radioshack.com/sm-high-output-infrared-led--pi-2062565.html
A high-performance infrared emitter whose peak wavelength is 940nm. These high-output infrared LEDs are a perfect light source for various kinds of security systems that need higher radiation. They also can be used in products ranging from TV remotes and auto-focus cameras to electronic gates. 
81.86.144.210 11:34, 14 June 2007 (UTC)
thread_title: IRLEDs

message: Don't Sony's newer cameras have phase detection sensors on the main sensor as well as under the mirror?  Should that be added to the phase detection section?  — Preceding unsigned comment added by 24.3.214.1 (talk) 05:14, 31 December 2012 (UTC)
thread_title:  Sony Phase Detection 

message: Three of the non-cited refs were added in 2005 at the end of a long string of edits, so presumably they are sources for some of what this guy added, here.  One was added since then (by pvosta, who did no other edits, and which doesn't appear to be a likely source for anything in the article, so I took it out).  We should try to cite them. Dicklyon (talk) 04:32, 26 December 2008 (UTC)
thread_title:  Article needs citations 

message: It appears unclear to the reader what the two-step method actually refers to.
Please clarify in the section on active systems.
::Polaroid SX-70 Sonar OneStep 
:I guess a single button-press did AE, AF, shutter !
::An exception to the two-step approach is the mechanical autofocus provided in some enlargers, which adjust the lens directly.
:Probably depends which make/model of enlarger - my only experience was a Leitz Focomat which had a wheel running on a linear cam parallel to the focussing-column, which moved the lens.
:However, it might be best to delete this sentence, since it's unlikely to mean much to the youth of today ! Or tomorrow. --195.137.93.171 (talk) 02:15, 16 May 2011 (UTC)
thread_title:  Two-step method 

message: "Phase detection" is something of a misnomer. Nikon show something that works exactly the same way as Leica's co-incident image rangefinder, except that the images are not co-incident, but have a 'correct' spacing when 'in focus'.
--195.137.93.171 (talk) 02:36, 16 May 2011 (UTC)
thread_title:  Phase detection method does not use the phase of the light ! 

message: whereas cameras like the EOS 40D and 7D have a custom function (III-1 and III-4 respectively) which can stop the camera trying to focus after it fails.
That doesn't match what is described in the rest of the trapfocus section, what is it talking about? --TiagoTiago (talk) 02:48, 27 October 2011 (UTC)
replies: text: Not sure, will someone who knows this system confer? Should it be deleted or reworded?P0PP4B34R732 (talk) 03:00, 27 October 2011 (UTC)
thread_title:  This doesn't sound like trapfocus... 

message: Hello fellow Wikipedians,
I have just modified  on Autofocus. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20090621131329/http://www.lfi-online.com:80/ceemes/page/show/issue_4_09_3 to http://www.lfi-online.com/ceemes/page/show/issue_4_09_3
*Added archive https://web.archive.org/web/20100818143041/http://www.eosdoc.com:80/manuals/?q=ATrapFocus to http://eosdoc.com/manuals/?q=ATrapFocus
When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at ).
Cheers.—InternetArchiveBot (Report bug) 05:39, 22 October 2016 (UTC)
thread_title:  External links modified 

message: Now in article this:
"A newer approach included in some consumer electronic devices, like mobile phones, is based on the time-of-flight principle, which involves shining a laser or LED light to the subject and calculating the distance based on the time it takes for the light to travel to the subject and back. This technique is sometimes called laser autofocus, and is present in many mobile phone models from several vendors. "
but more relible sources wrote :
"The laser focusing aid provides this light. The output from a low-power laser is scattered out across the scene, giving multiple points of light upon which the contrast detection system can hang. Focusing on a little point of light on a subject is just as good as focusing on the subject itself."
"The LG G3 focus aid uses a low-power Class I laser, whose output is effectively split into fragments in order to give multiple points of focus. An already low-power laser’s output will be tiny by the time it actually reaches your subject. "
Warmagain (talk) 13:35, 5 August 2020 (UTC)
thread_title:  did anyone anglophone want to fix marketing biasBS and\or [[WP:OR]] ? laser tech in toys!