DSLR camera parameters explained in detail
Whether used in a traditional film SLR camera lens or the increasingly popular dedicated digital SLR camera lens, the lens logo text, contains the basic properties of the lens are focal length parameters, aperture parameters, has the characteristics of other information.
The above can be divided into four specific:
Lens Attributes: usually indicates that the lens is AF or EF bayonet mount, and usually includes some type of identification lens
Aperture parameters: the coefficient indicates the maximum aperture of the lens, the lens also identifies some of the smallest aperture lens factor
In addition, the version number is one of the common text logo, which shows that the camera lens in the same specification, belongs to the first generations of products.
Detailed logo
In my more contact with other primary Photographer SLR lens, Canon and Nikon products occupy a large part of the other, such as Pentax, Sigma, Tokina and Tamron other well-known brands also have a world. Introduction The following will systematically identify the meaning of the above brand lens.
CANON
AL: Aspherical, shows that its use is not in the design of spherical lenses. The aim is to reduce the number of the lens, and decrease in volume to reduce the weight while providing better optical performance. Aspherical lens is generally used to solve a wide-angle and zoom lens flare and edge distortion and other issues. Also in the telephoto lens can improve the optical quality. Pentax lenses also use the “AL” to indicate its use of aspherical lenses.
DO: Diffractive Optical. DO marked with Canon lens with diffractive optical lenses, but also has characteristics of fluorite and aspherical lens. Simple to understand, identify which are generally upscale DO Canon lens.
EF: Electronic Focusing. This is specifically for the Canon EOS series cameras use electronic autofocus lens, we are more common Canon lens. It can be used in the full-frame and APS-frame Canon SLR and DSLR, its distinguishing feature is a red dot at the interface card for the alignment of the body position.
EF-S: APS-specific electronic format digital SLR bayonet. This is specifically for Canon APS-format digital SLR camera designed electronic camera, it is also more common in our Canon lenses. It only can be used in the APS format Canon DSLR, its distinguishing feature is the interface has a white square for aligning the fuselage card bit.
EMD: Electromagnetic Diaphragm. Has this technology can be electronically controlled lens aperture open and contraction.
Float: Floating System. This is a Canon lens design. Shot at close range, take a floating lens design will close aberration compensation in order to get better image quality.
FP: Focus Preset. This lens has a logo, generally belong to Canon’s high-end professional camera. Focus Preset function allows the lens to focus a certain distance memory, after setting the distance, the lens can automatically revert to the set focus distance, this focus reply function even in manual focus mode is also effective.
FT-M: Full time Manual. Canon has a full-time manual lens in the AF state can then manually adjust the lens focus.
IS: Image Stabilizer. Such a unique lens mount Canon Image Stabilizer, you can offset the image blur caused by hand shake in a certain range. This is one of Canon’s high-end professional camera identifies the common possession.
L: Luxury. It appears only in Canon’s professional camera identification information, is the top civil lens Canon logo. Such lenses are usually decorate the front and the red circle
S-UD: Super-UD glass. Such a logo indicating that the lens uses S-UD glass lens. The optical properties of S-UD close to fluorite glass, a role S-UD lens and a considerable role fluorite lens.
UD: UD glass. Such a logo indicating that the lens uses UD glass lens. UD glass optical properties close to fluorite, the role of two UD lenses with a fluorite lens considerable role.
USM: Ultra-Sonic Motor. USM lenses can use technology to achieve silent, fast auto-focus response. In addition, labeled “Ultrasonic” the word also refers to the use of the lens ultrasonic motor.
Description: EF 24-105mm f/4L IS USM EF Lens
We interpret the full parameters of this lens is: Canon EOS camera dedicated EF bayonet automatic electronic zoom; focal length range of 24-105mm; maximum aperture factor 4; Deluxe Edition red circle lens; with image stabilizer; uses a USM ultrasonic motor .
Nikon
AF: Auto Focus. Such lenses with the AF function with body, you can achieve autofocus; For AF and MF (manual focus full) mount compatible body is concerned, AF lenses used in MF body, usually lose autofocus capability. Of course, this also appears on the logo Minolta, Olympus, Pentax and convey the same meaning for the other lens.
AF-S: SWM motor autofocus. Nikon lenses with this logo, indicating that the use of the use of SWM motor.
ASP: Aspherical. This Nikon “ASP” and Canon “AL” is the same meaning as the expression, that is, the spherical lens is not used in the design of the lens, thereby reducing the number of the lens, and decrease in volume to reduce the weight while providing better optical performance. Aspherical lens is generally used to solve a wide-angle and zoom lens flare and edge distortion and other problems in the telephoto lens can improve the optical quality.
Similarly, Minolta, Tamron and Sigma also use “ASP” to express their lenses using aspherical lens.
CRC: Close Range Correction. And Canon floating system with the same functionality.
D: Distance. Nikon lenses with this logo, you can pass parameters to the fuselage shooting distance to achieve 3D matrix metering and flash control.
DX: DX series lens. Such lenses are Nikon lenses produced specifically for APS format DSLR use, can not be used on full-frame models. In addition, “IX” logo is also the word for its APS format Nikon camera models.
ED:Extra-Low Dispersion. Nikon has this identity with a complex achromatic lens design and the use of special low-dispersion glass lenses to reduce color aberration, thereby improving image quality telephoto lens, improving contrast and improve clarity. Pentax lens also uses the word “ED” as a sign of the use of ultra-low-dispersion technology.
Focusing function, Conventional lenses are by moving the entire lens system or front lens group moves to achieve focus. In telephoto and telephoto macro lens, marked with “IF” is the word of the lens by moving lens groups inside the lens to achieve focus, greatly improved macro capability. Using the zoom function benefits are: to keep the focal point in any of the actual size of the lens does not change. With “IF” as well as the role of the RF function. Use IF or RF function to represent the focus there Sigma, Tamron and Tokina.
M / A: Manual / Auto focusing. The logo has a Nikon lens, with manual / automatic focus switching function.
NIC: Nikon Integrated Coating. It is said that this lens makes use of Nikon lenses coating technology.
SIC: Super Nikon Integrated Coating. NIC is the improved coating technology.
SWM: Silent Wave Motor. It is Nikon’s exclusive ultrasonic motor zoom technology, can achieve silent autofocus and fast response.
VR: Vibration Reduction. This is Nikon’s lens anti-shake technology, and Canon’s “IS” the same, with Nikon lenses “VR” logo which can counteract the image blur caused by hand shake in a certain range.
Description: AF 80-400mm f/4.5-5.6D ED VR Lens
We interpret the full parameters of this lens: Nikon AF lenses; focal length range of 80-400mm; maximum aperture coefficient 4.5-5.6; distance information with predictive capabilities; using ultra-low dispersion lens; has vibration reduction function.
Sigma
APO: Apochromatic. The identification of such instructions Sigma achromatic lens using a complex design and the use of special low-dispersion glass lenses to reduce color aberration, thereby improving image quality telephoto lens, improving contrast and improve clarity.
DF: dual focus, the English name Dual Focus. When such a Sigma lens autofocus, the focusing ring does not rotate; while in manual focus, damping medium, so a good grip performance.
DG: Digital Group. Sigma lens focal length suitable for DSLR such use.
DL: DeLuxe. Such Sigma lens although its price is not too high, but functional. Like other Sigma lenses, which is equipped with a dedicated hood, with a half-step aperture, manual aperture settings, depth of field instruction, distance indicator, IR correction indicator.
EX: Excellence. Such camera lenses are lenses Sigma professional class, characterized by coating the lens barrel for the EX and EX marks there.
HF: Helical Focus. Such front of the lens does not rotate, easy to use custom hood and polarizer, is a special lens.
HSM: Hyper Sonic Motor. This is a unique ultrasonic motor Sigma Zoom / Focus technology.
UC: Ultra Compact. Such Sigma lens is small, light weight, easy to carry.
Description: Sigma 10-20mm F4-5.6HSM DG Lens
We interpret the full parameters of this lens: Sigma AF; focal length range of 10-20mm.maximum aperture factor 4-5.6.Includes an ultrasonic motor,are dedicated digital SLR camera.
In addition, different brands of lenses identity, we can see some of the words to the same information, such as:
CF Micro: continue focus micro. Such lenses can focus at all focal length directly to the macro shooting condition.
Macro: Macro function. Indicates that the lens has macro shooting capabilities are usually 1:2 and above amplification effect.
Finally, to remind you once again, these lenses are usually printed text or logo etched on the front of the lens of the pressure ring, but also the corresponding words in the mirror body printing practices. Some special lens, will in the “f-” iris identification system to further identify the “T-” iris identification, such as: Minolta STF 135/2.8 [T4.5]. In addition to those primary Photographic less common to have relations with the German optical industry lenses, such as Leica, Zeiss lenses will add like this in front of the word Distagon.
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