A dust reduction system, or dust removal system, is a technology employed by several manufacturers of digital single-lens reflex cameras (DSLRs) to solve the problem of dust particles adhering to the image sensor. A digital single-lens reflex camera ( digital SLR or DSLR) is a Digital camera that uses an automatic mirror system and Pentaprism Dust is a general name for minute Solid particles with Diameters less than 500 micrometers. Adhesion is the tendency of certain dissimilar molecules to cling together due to Attractive forces. An image sensor is a device that converts an optical image to an electric signal Every time lenses are changed there is a chance that dust may enter the camera body and settle on the image sensor. A photographic lens (also known as objective lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with Even if utmost care is taken when changing lenses, the mechanical parts such as shutter or quick-return mirror might still generate dust contamination due to friction occurring during their movement. In Photography, a shutter is a device that allows light to pass for a determined period of time for the purpose of exposing Photographic film or a light-sensitive At the same time, these parts create movement of the air inside the camera body which is enough to whirl the minuscule dust particles around.
These problems are not as critical with film SLRs as the dust disappears as the film is wound on, but with DSLRs the image sensor always remains in the same place. The single-lens reflex (SLR Camera uses an automatic moving mirror system which permits the photographer to see exactly what will be captured by the film or digital imaging Even with dust particles no bigger than 0. 1 mm (100 micrometres) and invisible to the human eye, once they land on the image sensor's surface they can degrade the quality of all the images taken hereafter. [1] Furthermore, it is usually a difficult task to remove the dust, often making it necessary to send the camera in for servicing.
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Two kinds of dust
There are two main types of dust that can potentially degrade image quality: Dust particles that adhere through electric force and dust particles that adhere through intermolecular force.
(1) Dust particles adhering through electrostatic charges
Most of the contamination to be found on the image sensor surface is caused by dust particles as small as just one micrometre (0. Adhesion is the tendency of certain dissimilar molecules to cling together due to Attractive forces. 001 mm) adhering to it through electrical charges. The particles themselves carry a positive static electric charge, while the image sensor is negatively charged, which makes them attract each other. The same phenomenon can be observed on the surface of LCD and CRT monitor screens. The cathode ray tube (CRT is a Vacuum tube containing an Electron gun (a source of electrons and a Fluorescent screen with internal or
(2) Dust particles adhering through intermolecular force
The intermolecular force is weaker than electrostatic charges. In Physics, Chemistry, and Biology, intermolecular forces are forces that act between stable Molecules or between functional groups of However, it still attracts microscopic-sized dust to the image sensor with infinitesimal force. While earthing the camera can help reduce the problem of electrostatic dust it does not reduce intermolecular attraction. If, for example, flour was drizzled into the camera, it would still adhere to the surface of earthed metal. This kind of dust is attracted by intermolecular force. Liquid also adheres to the image sensor by intermolecular force and such molecules adhere strongly due to their ability to get closer to the adhesion surface, making it harder for dust reduction systems to remove this type of contaminants completely. In such instances, wiping the optical elements in front of the image sensor with cleaning fluid may be necessary.
Current dust reduction systems
Olympus was the first to include a dust reduction system on a DSLR, featuring their Supersonic Wave Filter (SSWF) dust reduction technology on the Olympus E-1 in 2003. ( is a Japanese company specializing in Optics and Imaging. Olympus was established on October 12 1919 initially specialized in microscope The Supersonic Wave Filter (SSWF is a Dust reduction system developed by Olympus to overcome the negative effect of dust particles landing on the Image sensor The Olympus E-1, introduced in 2003, was the first DSLR designed from the ground up for digital photography All Olympus DSLRs have included this system, as have Panasonic's and Leica's DSLRs; both companies use Olympus technology.
Other manufacturers, namely Sony (2006), Canon (2006), Pentax (2006), and Nikon (2007), followed suit with their own dust removal technologies. is a multinational conglomerate corporation headquartered in Minato Tokyo, Japan, and one of the world's largest Media conglomerates with is a Japanese Multinational corporation that specializes in imaging and optical products including Cameras photocopiers and Computer printers is a wholly owned division and brand name of Hoya Corporation. ( also known as Nikon or Nikon Corp, is a Multinational corporation headquartered in Tokyo Japan specializing in Optics Each manufacturer uses a somewhat different system.
There have been several attempts by Camera magazines to test the various dust reduction systems to see how effective they are. Pixinfo,[2] Chasseur d’Images,[3][4] and Camera Labs[5] have all published their opinions, which can be summarized as saying that none of the systems are completely effective, but that the Olympus SSWF system is significantly better than most of the others, with the Nikon system perhaps a close second. [6]
References
- ^ http://www.digital-slr-guide.com/digital-slr-sensor-dust.html Description of the problem of dust on the image sensor at digital-slr-guide. com
- ^ Irházy, Róbert (2007-03-20). Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1600 - The Linköping Bloodbath takes place on Maundy Thursday in Linköping, Sweden. Review: Dust removal systems / sensor cleaning. Pixinfo. com. Retrieved on 2008-03-05. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 363 - Roman Emperor Julian moves from Antioch with an army of 90000 to attack the Sassanid Empire, in a
- ^ Les dispositifs anti-poussières : du pipo ? Sauf Olympus ? (French). MacAndPhoto. com (2007-03-07). Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 161 - Roman Emperor Antoninus Pius dies and is succeeded by co-Emperors Marcus Aurelius and Lucius Verus Retrieved on 2008-03-05. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 363 - Roman Emperor Julian moves from Antioch with an army of 90000 to attack the Sassanid Empire, in a
- ^ Battle of DSLR sensor dust busters. DPReview forums (2007-02-22). Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1495 - King Charles VIII of France enters Naples to claim the city's throne Retrieved on 2008-03-05. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 363 - Roman Emperor Julian moves from Antioch with an army of 90000 to attack the Sassanid Empire, in a
- ^ Laing, Gordon (June 2007). Olympus E-510 full review - verdict. Camera Labs. Retrieved on 2008-03-05. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 363 - Roman Emperor Julian moves from Antioch with an army of 90000 to attack the Sassanid Empire, in a
- ^ Laing, Gordon (March 2008). Nikon D60 review. Camera Labs. Retrieved on 2008-03-06. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 1079 - Omar Khayyám completes the Iranian calendar. 1454 - Thirteen Years' War: Delegates of
External links
Sensor dust: Cause prevention is better than cure
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