NationMaster - Encyclopedia: Ultrasonic motor

The EF lens mount is the heart of the Canon EOS line of cameras made by Canon Inc.. Unlike the EF's predecessor, the FD, the EF mount uses a bayonet-style mount instead of the FD's breech-lock mount. The EF attaches very similarly to the BNC RF connector. The electronic (gold-plated) contacts of an EF mount lens. ... The electronic (gold-plated) contacts of an EF mount lens. ... The Canon EOS (Electro-Optical System) film and digital SLR camera system was introduced in 1987 with the Canon EOS 650. ... A camera is a device used to take pictures (usually photographs), either singly or in sequence, with or without sound, such as with video cameras. ... Canon logo Canon Inc. ... The Canon FD (Full Display) mount was introduced in March 1971 with the Canon F-1. ... Male BNC connector Wikimedia Commons has more media related to: BNC connector The Bayonet Neill-Concelman connector is a type of RF connector used for terminating coaxial cable. ... A radio frequency connector is an electrical connector designed to work at radio frequencies. ...

1 History
2 Versatility
3 Related technologies
4 List of EF lenses
- 4.1 Zoom
- 4.2 Prime
5 See also
6 External links

History

When the EF mount was introduced, it had the largest mount diameter of 54mm (internal) among all 35mm SLR cameras, allowing large aperture lenses to be designed for the EOS system. In photography, the aperture defines the size of the opening in the lens, which in advanced cameras can be adjusted to control the amount of light reaching the film or digital sensor (CCD or CMOS). ...

Unlike the standard lens mounting technology of the time, the EF series used a motor inside the lens itself for focusing. This allowed for autofocusing lenses which did not require mechanical contacts in the mount mechanism, only electrical ones to supply power to the lens motor. Thus, the mounting mechanism was simpler and more durable. Also, the motors were designed for the particular lens they were installed in. A device connected to an optical system. ...

The EF series has since grown into a mature system with over 50 lenses for all types of applications, from landscapes to portraits to sports and photojournalism. Canon EF lenses also demonstrate successful commercialisation of mechanical and optical technologies, such as the Ultrasonic Motor (USM) drive, Image Stabilizer (IS), Diffractive Optics (DO) and using fluorite and aspherical elements in the construction of their L-series (or "Luxury") lenses for superb image quality. Octahedral fluorite crystals from New Mexico, USA Fluorite (also called fluor-spar) is a mineral composed of calcium fluoride, CaF2. ...

Versatility

Although Canon does not endorse (and in fact warns against) the use of third-party lenses and adapters, the EF lens mount is ideal for the use of adapters, due to its large diameter and the relatively short distance of 44.0mm between the imaging plane and the lens flange [1]. It is thus possible to mount lenses using the Nikon, Olympus OM, Leica R and universal M42 lens mounts (among others) by the use of a simple mechanical adapter. Ironically, the earlier FD mount is still not usable, even with adapters, because its imaging plane to flange distance was only 42.0mm. Of course, with a purely manual connection, the aperture and focus controls of the lens cannot be controlled or read from the camera; the lens must be focused manually. In addition, since the only possible metering is through-the-lens, the lens must be manually stopped down to accurately meter at anything less than full aperture. (This is called stop-down metering.) The Canon FD (Full Display) mount was introduced in March 1971 with the Canon F-1. ...

For other lens types, an adapter would act as an extension tube, causing the lens to lose the ability to focus to infinity. Alternatively, the lens adapters would include optical elements and act as weak teleconverters, as well as possibly losing considerable optical quality. Because of this, it is generally preferred to use lenses that can be mounted at their preferred offsets.

Related technologies

With the introduction of the EOS-300D and later the 20D, Canon introduced a variation on the standard EF lens mount called EF-S. The Canon EOS_300D, marketed in The Americas as the EOS Digital Rebel and in Japan as the EOS Kiss Digital, is a 6. ... The EOS-20D has a magnesium-alloy body. ... The EF-S lens mount is a derivative of the EF lens mount created for (digital) SLR cameras with APS-C sized image sensors. ...

Ultrasonic Motor drive

Ultrasonic Motor (USM) lenses first appeared with the introduction of the EF 300mm f/2.8L USM lens in 1987. Canon is the first camera maker to successfully commercialise the USM technology. EF lenses equipped with USM drives have fast, silent and precise autofocus operations, and consumes less power compared to other AF drive motors. 1987 is a common year starting on Thursday of the Gregorian calendar. ...

There are two types of USMs, the ring-type USM and the micro USM. Ring-type USM is always preferred because of its superior performance and efficiency, and it allows for full-time manual focus operations without switching out of AF mode. Micro USM is used in cheaper lenses to bring down the overall cost of the lens.

Image Stabilizer

A photograph can easily be ruined when handshake or vibration is introduced during long exposure shots. The Image Stabilizer (IS) counters such problems by optically correcting such shakes with gyro sensors and lens groups that move in relation to the shakes, thus minimising or even eliminating minute vibrations from the image. In photography, exposure is the total amount of light allowed to fall on the film (or electronic sensor in the case of digital photography) during the process of taking a photograph. ... Acrobatic bicycle is possible thanks to gyroscopic effects A gyroscope is a device which demonstrates the principle of conservation of angular momentum. ...

A general rule-of-thumb to overcome such vibrations would be to set the shutter speed equal to or faster than the reciprocal of the lens' focal length (e.g. 1/60s for a 50mm lens). IS lenses can improve on this rule by up to three stops. That is, the same 50mm lens could be used at 1/8s. The shutter speed dial of a Fujika STX-1. ... In mathematics, the reciprocal, or multiplicative inverse, of a number x is the number which, when multiplied by x, yields 1. ... A 35mm lens set to f/11, as indicated by the white dot above the f-stop scale on the aperture ring In photography the f-number (focal ratio) expresses the diameter of the diaphragm aperture in terms of the effective focal length of the lens. ...

Diffractive Optics

Diffractive Optics (DO) are used in lens designs that would otherwise require large and heavy chunks of glass. DO lenses, compared to non-DO lenses of similar focal length and aperture values, are usually smaller and lighter. In addition, DO lenses have superior chromatic aberration suppression characteristics that allows for sharper photographs. Chromatic aberration is caused by the dispersion of the lens material, the variation of its refractive index n with the wavelength of light. ...

Nevertheless, DO elements are extremely expensive to make due to its high rejection rate, and therefore is introduced in limited EF lenses. Currently only the EF 400mm f/4 DO IS USM and the EF 70-300mm f/4.5-5.6 DO IS USM contain DO elements.

DO lenses are identified with a green ring on the lens barrel.

L-lens

The 70-200mm F2.8L lens

Top-of-the-line Canon EF lenses are designated as L-lenses, or "Luxury" lenses. L-lenses have superior optical performance and are built with a solid construction to withstand constant use and harsh conditions. L-lenses are usually reserved only for use by professionals and serious amateurs due to their high price. Image File history File links Download high resolution version (699x1593, 202 KB)The Canon EF 70-200mm F2. ... Image File history File links Download high resolution version (699x1593, 202 KB)The Canon EF 70-200mm F2. ... The F2. ...

An EF lens is designated as an L-lens only when it contains at least one fluorite or ultra-low dispersion glass element, combined with super-low dispersion glass and aspherical elements. L-lenses are also usually equipped with USM, IS and/or DO as well, but what sets an L-lens apart from the rest is its optical performance. In optics, dispersion is a phenomenon that causes the separation of a wave into spectral components with different frequencies, due to a dependence of the waves speed on its frequency. ...

L-lenses with a long focal length (e.g. 300mm) usually have a white barrel to reduce heat absorption under the sun that may otherwise affect the performance of the lens. However, L-lenses are identified not by the color of the lens barrel, but by the distinctive red ring on the lens barrel.

List of EF lenses

The following is a list of EF lenses made by Canon. Please note that the "I", "II", "III", etc. after the focal length(s) indicates the latest generation number for that model.

The EF lenses are grouped below by their focal lengths:

#Zoom: for zoom lenses that have a range of focal lengths
#Prime: for prime lenses that have a single focal length

A Canon Inc. ... Categories: Stub | Lenses by type | Optics ...

Zoom

	Focal length(s)	Aperture range	Macro	Ultrasonic motor	Image stabilization	L-series	Diffractive optics
Article	16-35mm	2.8	No	Yes	No	Yes	No
Article	17-35mm	2.8	No	No	No	Yes	No
Article	17-40mm	4	No	Yes	No	Yes	No
Article	20-35mm	2.8	No	No	No	Yes	No
Article	20-35mm	3.5-4.5	No	Yes	No	No	No
Article	22-55mm	4-5.6	No	Yes	No	No	No
Article	24-70mm	2.8	No	Yes	No	Yes	No
Article	24-85mm	3.5-4.5	No	Yes	No	No	No
Article	28-70mm	2.8	No	Yes	No	Yes	No
Article	28-70mm II	3.5-4.5	No	No	No	No	No
Article	28-80mm II	3.5-5.6	No	No	No	No	No
Article	28-80mm V	3.5-5.6	No	Yes	No	No	No
Article	28-90mm II	4-5.6	No	Yes	No	No	No
Article	28-90mm III	4-5.6	No	No	No	No	No
Article	28-105mm II	3.5-4.5	No	Yes	No	No	No
Article	28-105mm	4-5.6	No	Yes	No	No	No
Article	28-135mm	3.5-5.6	No	Yes	Yes	No	No
Article	28-200mm	3.5-5.6	No	Yes	No	No	No
Article	28-200mm	3.5-5.6	No	No	No	No	No
Article	28-300mm	3.5-5.6	No	Yes	Yes	Yes	No
Article	35-70mm	3.5-4.5	No	No	No	No	No
Article	35-70mm	3.5-4.5A	No	No	No	No	No
Article	35-80mm III	4-5.6	No	No	No	No	No
Article	35-80mm	4-5.6	No	Yes	No	No	No
Article	35-105mm	3.5-4.5	No	No	No	No	No
Article	35-105mm	4.5-5.6	No	No	No	No	No
Article	35-135mm	3.5-4.5	No	No	No	No	No
Article	35-135mm	4-5.6	No	Yes	No	No	No
Article	35-350mm	3.5-5.6	No	Yes	No	Yes	No
Article	38-76mm	4.5-5.6	No	No	No	No	No
Article	50-200mm	3.5-4.5	No	No	No	No	No
Article	50-200mm	3.5-4.5	No	No	No	Yes	No
Article	55-200mm II	4.5-5.6	No	Yes	No	No	No
Article	70-200mm	2.8	No	Yes	Yes	Yes	No
Article	70-200mm	2.8	No	Yes	No	Yes	No
Article	70-200mm	4	No	Yes	No	Yes	No
Article	70-210mm	3.5-4.5	No	Yes	No	No	No
Article	70-210mm	4	No	No	No	No	No
Article	70-300mm	4.5-5.6	No	Yes	Yes	No	Yes
Article	75-300mm	4-5.6	No	Yes	Yes	No	No
Article	75-300mm III	4-5.6	No	Yes	No	No	No
Article	75-300mm III	4-5.6	No	No	No	No	No
Article	80-200mm	2.8	No	No	No	Yes	No
Article	80-200mm	4.5-5.6	No	Yes	No	No	No
Article	80-200mm II	4.5-5.6	No	No	No	No	No
Article	90-300mm	4.5-5.6	No	No	No	No	No
Article	90-300mm	4.5-5.6	No	Yes	No	No	No
Article	100-200mm	4.5A	No	No	No	No	No
Article	100-300mm	4.5-5.6	No	Yes	No	No	No
Article	100-300mm	5.6	No	No	No	No	No
Article	100-300mm	5.6	No	No	No	Yes	No
Article	100-400mm	4.5-5.6	No	Yes	Yes	Yes	No

The focal point F and focal length f of a positive lens, a negative lens, a concave mirror, and a convex mirror. ... In photography, the aperture defines the size of the opening in the lens, which in advanced cameras can be adjusted to control the amount of light reaching the film or digital sensor (CCD or CMOS). ... Colony of aphids on a stem. ... The EF 16-35mm lens is a wide-angle lens made by Canon Inc. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... 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A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... The F2. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... The F2. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... The F2. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A green tick, copy pasted from a screenview of a unicode character, until a better replacement can be found. ... A red X, copy pasted from a screenview of a unicode character, until a better replacement can be found. ...

Prime

	Focal length(s)	Aperture range	Macro	Ultrasonic motor	Image stabilization	L-series	Diffractive optics
Article	14mm	2.8	No	Yes	No	Yes	No
Article	15mm (fisheye)	2.8	No	No	No	No	No
Article	20mm	2.8	No	Yes	No	No	No
Article	24mm	1.4	No	Yes	No	Yes	No
Article	24mm	2.8	No	No	No	No	No
Article	28mm	1.8	No	Yes	No	No	No
Article	28mm	2.8	No	No	No	No	No
Article	35mm	1.4	No	Yes	No	Yes	No
Article	35mm	2	No	No	No	No	No
Article	50mm	1	No	Yes	No	Yes	No
Article	50mm	1.4	No	Yes	No	No	No
Article	50mm II	1.8	No	No	No	No	No
Article	50mm	2.5	Yes (Compact)	No	No	No	No
Article	85mm	1.2	No	Yes	No	Yes	No
Article	85mm	1.8	No	Yes	No	No	No
Article	100mm	2	No	Yes	No	No	No
Article	100mm	2.8	Yes	No	No	No	No
Article	100mm	2.8	Yes	Yes	No	No	No
Article	135mm	2	No	Yes	No	Yes	No
Article	135mm (SoftFocus)	2.8	No	No	No	No	No
Article	180mm	3.5	Yes	Yes	No	Yes	No
Article	200mm	1.8	No	Yes	No	Yes	No
Article	200mm II	2.8	No	Yes	No	Yes	No
Article	300mm	2.8	No	Yes	No	Yes	No
Article	300mm	2.8	No	Yes	Yes	Yes	No
Article	300mm	4	No	Yes	No	Yes	No
Article	300mm	4	No	Yes	Yes	Yes	No
Article	400mm II	2.8	No	Yes	No	Yes	No
Article	400mm	2.8	No	Yes	Yes	Yes	No
Article	400mm	4	No	Yes	Yes	No	Yes
Article	400mm	5.6	No	Yes	No	Yes	No
Article	500mm	4	No	Yes	Yes	Yes	No
Article	500mm	4.5	No	Yes	No	Yes	No
Article	600mm	4	No	Yes	No	Yes	No
Article	600mm	4	No	Yes	Yes	Yes	No
Article	1200mm	5.6	No	Yes	No	Yes	No

External links

Categories: Canon EF lenses

Results from FactBites:

K-Technik - Patente (2053 words)
	Ultrasonic motors do not generate a disruptive magnetic field and therefore do not influence the magnetic field sensors of a compass.
	Firstly, the said ultrasonic motor is amagnetic therefore by definition avoids inducing deviation of the magnetic field sensors of the compass.
	Since the piezo motor, in contrast to the conventional "Lavet" motor which is usually one directional, operates in two directions (by changing the frequency of heading) it is especially suitable for the functioning of a compass and/or altimeter.

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