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Old 22-01-2009, 01:57 PM   #1
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FAQ: Nikon/Canon SLR Acronyms

Just for the easier understanding (Source: Courtesy of Wikipedia):

Nikon:

FE - Fish Eye - Circular rounded very wide angle lense, gives that "big head" effect when used up close


VR — Vibration Reduction. Uses a moving optical group to reduce the photographic effects of camera shake. Some VR lenses also support a panning mode, detecting horizontal movement of the lens and minimizing only vertical vibration. The second generation of VR is called VR II, which is designed to offer another 1-stop advantage over original VR, but lenses with this feature are still designated simply "VR."


IF - Internal Focus. Focusing is accomplished through the movement of internal lens groups, eliminating extension and rotation of the front lens element. (normally does not extend as well, eg: AF-S 28-70 f/2.8)


AF - Auto-focusing - No need explain


AF-I — Autofocus-Internal. Driven by a coreless DC motor. Used only in long telephoto lenses (300 mm f/2.8 through 600 mm f/4.0) starting in 1992. Replaced with AF-S in 1996.

AI-P or P — "AI with Program." CPU-enabled variation of AI-S. Includes only the 45/2.8P, 500/4P and 1200-1700/5.6-8P. Not to be confused with early lenses marked "Nikkor-P" meaning a 5-element lens (see pre-autofocus designations above).

AF-N — Indicates the "New" version of an AF lens. The change from plastic focus rings on early AF lenses to the a new "rubber inset focus ring" (RIFR) is often indicated by the AF-N designation

SWM - Silent Wave Motor - Quieter + faster focusing especially with faster AF bodies


DX - Cropped Format sensor - 1.5x (refer to FAQ: Purchasing a DSLR)


FX - Full format sensor - 1.0x (refer to FAQ: Purchasing a DSLR)



AI — Manual focus with "Automatic Indexing" light meter coupling, introduced in 1977. In addition to the pre-AI metering prong, an AI lens includes a ridge on its aperture ring that encodes the aperture setting relative to the maximum aperture, and a post on its mounting flange that encodes the value of the maximum aperture. This post is also found on AI-S lenses.

AI-S - The successor to AI, AI-S added two mechanical features required for the automatic or semi-automatic exposure modes of the Nikon FA, F301/N2000, F501/N2020, and F4 cameras. First, AI-S lens apertures move linearly in relation to their stop-down levers, and this feature is indicated by a special notch in the lens mount. Second, AI-S lenses with a focal length of 135mm or longer are indicated by a special ridge on the lens mount (used by FA, F501, and F4 only). The development of CPU-enabled AI-P and AF lenses meant that no later cameras would require these features, although the linear aperture control of AI-S remains advantageous over the non-standardized control of AI and pre-AI lenses. The term AI-S is now commonly used to refer to manual focus lenses, although all Nikon autofocus lenses with aperture rings also meet the AI-S specification.


N — Indicates the Nano Crystal Coat, a relatively new type of lens coating that originated in Nikon's semiconductor division. Lenses with this coating feature the logo of an "N" inside an elongated hexagon on the name plate.


ED - "Extra-low Dispersion" glass incorporated to reduce chromatic aberration. "Super ED" glass has been introduced as well.


D - Distance. Indicated after the f-number. It means the lens is capable of using Nikon's 3D Matrix Metering on bodies that support it. The lens transmits focus distance information, which is incorporated into the camera's exposure calculations. Not to be confused with early lenses marked "Nikkor-D" meaning a 10-element lens (see pre-autofocus designations above).


G — Indicated after the f-number. G lenses do not have an aperture ring, and the aperture can only be controlled electronically by the camera body. Only autofocus bodies with command dials are capable of controlling G lenses. Older autofocus bodies will work with G lenses in shutter priority and program modes. Some recent G lenses feature a gasket around the mounting flange. G lenses otherwise have the same characteristics as D lenses.


DC — Defocus Control. DC lenses have a separate control ring for spherical aberration, which affects primarily the appearance of out-of-focus areas, also known as bokeh. At extreme settings, DC lenses can generate an overall soft-focus effect.


PC — Perspective Control. Lens features shift movements (and also tilt movements on some models) to control perspective and depth-of-field. Newer PC lenses are designated PC-E (see electromechanical designation E above). Not to be confused with early lenses marked "Nikkor-P·C" meaning a 5-element coated lens



==========================

Canon:



FE - Fish Eye - Circular rounded very wide angle lense, gives that "big head" effect when used up close


IS - Image Stabiliser - Reduces handshake vibration up to 2 stops (3 stops as undocumented actually).


USM - Ultrasonic Motor - Quieter + faster focusing especially with faster AF bodies


EF-S - Cropped Format sensor - 1.6x (refer to FAQ: Purchasing a DSLR)


EF - Full format sensor/As well as lens mount type - 1.0x (refer to FAQ: Purchasing a DSLR)


DO - Diffractive Optic elements


L - Luxury - Aka expensive high end lenses.
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Old 22-01-2009, 02:01 PM   #2
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Deciphering Nikon Glass names

To use the above glossary, you need to look at the box of the lense or whatever somebody is selling online with the whole string in question.

Most of the terms above will combine into 1 lense.


Eg 1:


Nikkor AF-S 17-35 f/2.8 IF-ED

Explanatory:

Focal length - 17mm to 35mm

Aperture is fixed across all zoom at f/2.8

Lens is Autofocus (AF)

Lens has Silent Wave Motor (AF-S)

Lens will be Internal Focusing (IF)

Lens is constructed with Extra-Low Dispersion elements (ED)


Eg 2:



Nikkor AF 10.5 f/2.8DX FE


Explanatory:

Focal length - 10.5mm (Fixed)

Lens is Autofocus (AF)

Lens is a Fish Eye (FE)

Lens is a DX format, for use on DX cameras.




Eg 3.

Nikkor AF 24-80 f/2.8-4 D


Explanatory:

Focal length - from 28mm to 105mm

Lens is Autofocus (AF)

Lens has distance chip (D)

Lens aperture starts at f/2.8 @ 28mm, as zooms out, reaches a max of f/4 - You can still set apertures smaller than f/4, but at 85mm, f/4 is the max it can open.
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Old 22-01-2009, 02:09 PM   #3
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Deciphering Canon Glass names

To use the above glossary, you need to look at the box of the lense or whatever somebody is selling online with the whole string in question.

Most of the terms above will combine into 1 lense.


Eg 1:


Canon EF 16-35 II f/2.8L USM

Explanatory:

Focal length - 16mm to 35mm

Lens is a Gen 2 Make (II)

Lens is Autofocus (As with all new EF lenses)

Lens has Ultrasonic Motor (USM)

Lens is a luxury type high end glass (L)

Lens is a 2nd make of the original release (II)


Eg 2:



Canon EF-S 17-85 f/3.5-5.6 IS USM


Explanatory:

Focal length - 17-85mm

Lens is Autofocus (As with all new EF/EF-S lenses)

Lens is a EF-S, only for 1.6x crop format cameras (EF-S)

Lens has Image Stabiliser to reduce hand shake (IS)

Lens has Ultrasonic Motor (USM)

Lens max aperture starts at f/3.5 @ 17mm gradually increases until max f/5.6 before 85mm. (f/3.5-5.6)
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Old 22-01-2009, 06:43 PM   #4
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Mods should sticky this...
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Old 26-01-2009, 01:21 PM   #5
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as requested
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Old 09-06-2009, 02:47 PM   #6
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Updated some explainatory for the examples and made it clearer.
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Old 01-07-2009, 12:07 PM   #7
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got noob qns...

1) say if i got a 500D, supposed to use EF-S lens, but can i use EF lens on it? do i need an adaptor?
how abt vice versa? can a full frame dslr use EF-S lens?

2) how to know if the lens im gg to buy can physically attach to my dslr? be it 3rd-party or original maker lens.
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Old 01-07-2009, 02:01 PM   #8
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You can use EF lenses on the 500D's EF-S mount no problem.
Mounting an EF-S lens on a full frame DSLR is dangerous. I believe the Canon engineers made it impossible, but if it were possible, the rear element of EF-S lenses sit much further back than EF lenses and will likely obstruct the path of the mirror and you will probably damage both the mirror and the lens rear element.

If it is a Canon EF or EF-S, then you can mount it. For third party, just make sure that they specify that it is for Canon mount. If you have a full frame camera, then you will also need to make sure that the lens you are looking at can be used on full frame, this will depend on the brand (Tokina, Tamron or Sigma usually)
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Old 05-08-2010, 10:44 AM   #9
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1)
EF-S lens the mounting indicator is a red dot.
EF lens the mounting indicator is a white dot.
they both mount at different points on the camera

if not wrong there is no way you can mount an EF-S lens on a FF cuz of that.

2)
bring your camera there, any reputable shop will know what you need.








the canon glossary is missing the new H-IS

Hybrid IS, stabalize in 2 directions, up/down and angle movement also
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Old 14-08-2010, 06:06 PM   #10
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1)
EF-S lens the mounting indicator is a red dot.
EF lens the mounting indicator is a white dot.
they both mount at different points on the camera

if not wrong there is no way you can mount an EF-S lens on a FF cuz of that.

2)
bring your camera there, any reputable shop will know what you need.






the canon glossary is missing the new H-IS

Hybrid IS, stabalize in 2 directions, up/down and angle movement also
EF-S is white dot, EF is red dot.
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Old 18-08-2010, 07:49 PM   #11
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what is the price range for Fisheye len? any fisheye zoom len available and how much? how to choose for fisheye len? please
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