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Canon EF : Lens mount designation for Canon's current camera system. Stands for Electronic Focus.
EF-S : Lens mount designation for Canon's current APS-C digital SLRs (reduced sensor size), for example the 20D, 350D, and 300D models. The S stands for "short back focus," implying that the rear element of the lens is closer to the sensor than with regular EF lenses. EF-S lenses will not mount on Canon film SLRs or Digital SLRs that do not have an EF-S mount.
TS-E : Tilt-shift lens, for control of perspective and depth of field.
MP-E : Macro Photo Electronic. These lenses do not have autofocus, the "electronic" refers to the electronic aperture control. Specialised lenses designed for macro photography.
L Lenses : L refers to Canon's professional range of lenses. Many people take the L to stand for Luxury. Purchases of such lenses can lead to 'L Fever', a condition where all future lense purchases must be L class.
IS : IS refers to Image Stabilisation, Canon's anti-shake feature. Also known as VR (Vibration Reduction - Nikon), OS (Optical Stabilisation - Sigma).
USM : USM refers to the autofocus motor. Ultrasonic Motors (USM) are piezoelectric and offer very fast and silent autofocusing. There are two types: A standard cheaper micro-USM which just replaces the regular electromagnetic AFD motor, and a Ring USM (internal focus) which is much faster and also incorporates fulltime manual focus overide without leaving AF mode (or damaging the focus mechanism).
AFD : An older type of AF motor, AFD (Arc-Form drive) is generally slower and noisier than USM.
DO : Diffractive Optics - DO lenses are found with green rings (as opposed to the red ring around the L-series lenses) to set them apart. DO considerably cuts the size and weight of a lens down while maintaining quality. Still not as sharp as a true L lens but in many cases a viable alternative when size or portability are a concern. How DO works you can read at
http://diffractive-optics.org/ A note about the maximum aperture The maximum aperture in a 135mm F/2 lens is (135/2) = 67mm. This means the hole that lets the light in opens up to 67mm. This explains why lenses with larger apertures are more expensive: they require more glass inside larger barrels.
Nikon AF-I Internal auto-focusAF-D/G with auto-focus motor built into the lens barrel itself
AF-S Silent-wave auto-focusAF-D/G with ultrasonic AF motor
ASP ASPherical lens elements A type of lenses that virtually eliminates the problem of coma and other types of lens aberration. The are particularly good at correcting distortion in wide-angle lenses as well as contributing to a lighter and smaller lens design
CRC Close Range CorrectionProvides superior image quality at close focusing distances and increases the focusing range
D (AF-D) Lens equipped with a chip which allows the body to assess the distance to the object being photographed and exposes for that object correctly
DC Defocus-image ControlA creative feature for photographers; control the degree of spherical aberration
DX Digital eXpandedLenses for DSLRs with a smaller sensor than 35mm
ED Extra-low DispersionPrevents chromatic aberration because it concentrates and directs the wavelength of the light more effectively onto the camera's sensor
G (AF-G) Same as AF-D, but without an aperture ring
IF Internal FocusTo ensure stability in focusing, this lens moves the inner lens group or groups without changing the lens' physical length
N Nano coatingNon-reflective coating for clearer images with increased detail by reducing reflection from inside the lens
RF Rear FocusThis lens is equipped with a system that moves the rear lens group for focusing SIC Super Integrated CoatingMultilayer coating of the optical elements in lenses
SWM Silent Wave MotorUltrasonic AF motor
VR Vibration ReductionA family of techniques used to reduce blurring associated with the motion of a camera. Specifically, it compensates for pan and tilt of a camera
Sigma EX : An abreviation for the "Excellence" range of lenses. These lenses are similar to Canon's L series, claimed to be superior in build and optical quality to regular lenses. Like the L series they have a distinctive exterior.
DG : A DG lens can be used with both 35mm SLR and digital SLR cameras. DG refers to additional optical coatings that are meant to minimize reflections of light off the sensor itself.
DC : A DC lens is designed so the image circle matches the smaller size of a digital SLR's image sensor compared to a 35mm frame. These are typically lighter than DG lenses but are not suitable for 35mm SLRs.
ASP: An aspherical lens, which is more compact than conventional lenses.
APO: APO or apochromatic lenses are made using a low dispersion glass to reduce chromatic aberration.
OS: Optical Stabiliser. More or less identical to Canon's IS and Nikon's VR.
HSM: "Hypersonic Motor," which in the same way as Canon's USM is used to power the autofocus mechanism and is generally quieter and faster than conventional electromagnetic motors.
RF: Rear focus lenses move the rear lens elements delivering faster, more quiet focusing.
IF: Inner focus lenses move the middle lens elements which does not change the lens' overall length when focusing. This results in better stability, which is useful for telephoto shooting.
DF: A dual focus lens. The focus ring on the lens pushes forward and backwards dis-engaging it so it does not rotate during autofocus.
Conv: These lenses are compatible with Sigma's teleconverters without and retain proper automatic exposure function.
Tamron AD Anomalous DispersionSpecial optical glass which delivers large partial dispersion ratios relative to a specific light wavelength zone
ASL Aspherical Lens elements A type of lenses that virtually eliminates the problem of coma and other types of lens aberration. They are particularly good at correcting distortion in wide-angle lenses as well as contributing to a lighter and smaller lens design
Di Digitally integrated design Optical system designed to meet the performance characteristics of DSLR cameras as well as film cameras
Di II Digitally integrated design Lenses made exclusively for DSLR cameras with APS-C sensors
HID High Index High Dispersion glass Minimises on-axis and lateral chromatic aberrations
IF Internal FocusTo ensure stability in focusing, this lens moves the inner lens group or groups without changing the lens' physical length
LD Low DispersionLow Dispersion elements which effectively compensate for chromatic aberration that is a problem at the telephoto end and lateral aberration at the wide angle end SP Super PerformanceThe first priority in producing these lenses have been superior specifications and outstanding performance free from cost restraints
USD UltraSonic Silent DriveUltrasonic AF motor
VC Vibration Compensation - A family of techniques used to reduce blurring associated with the motion of a camera. Specifically, it compensates for pan and tilt of a camera
XR eXtra RefractiveHi Refraction index glass elements resulting in minimum aberration. Allows smaller lens diameters while maintaining aperture values for overall compactness
ZL Zoom LockPrevents undesired barrel extension
TokinaASA : – spherical - A type of lenses that virtually eliminates the problem of coma and other types of lens aberration. The are particularly good at correcting distortion in wide-angle lenses as well as contributing to a lighter and smaller lens design
AT-X : Advanced Technology eXtraLenses that are manufactured without compromises, using the most advanced design and fabrication technologies available
D : Digitally optimized coatings
DX : Only compatible with a cropped sensor (APS-C)
F&R : Front and Rear asphericalAspherical molded glass element in the front and in the rear FC Focus ClutchOne-touch focus clutch allows the focus to be moved quickly from the AF position back into the MF position
FE : Floating Element
HL : DHigh Refraction, Low Dispersion
IF : Internal FocusTo ensure stability in focusing, this lens moves the inner lens group or groups without changing the lens' physical length
IRF : Internal Rear FocusThis lens is equipped with a system that moves the rear lens group for focusing
PRO : Lenses that have hardened Alumite (Armalite) finish to increase durability
SD : Super Low DispersionPrevents chromatic aberration because it concentrates and directs the wavelength of the light more effectively onto the camera's sensor
Pentax
K : Is the first generation K mount lens, Manual Focus, Manual Exposure. (Listed as Pentax smc)
M : Second generation of K mount lens, smaller then their K counterparts, manual focus manual exposure
A : First Auto exposure lenses from Pentax, manual focus.
F : First generation Auto Focus, Auto exposure lens
FA : Second generation Auto Focus, Auto Exposure lens, On board chip contains lens MTF data for Hyper Program compatible bodies
FA-J : Similar to FA lenses but don’t have an aperture ring.
DA : Digital Lenses, no aperture ring, some have reduced images circle some don’t, Digital coatings and optimised construction.
D-FA : Digital Lenses, aperture ring, covers a 35mm frame. Digital coatings and optimised construction.
* (star) lens : Pentax’s equivalent to Canon’s L, lenses of exception quality. (A, F, FA)
DA* : Pentax’s High spec Digital lenses, Exceptional quality, weather sealed, SDM (Super Sonic Direct drive Motors)
Limited : A prime lens of unparalleled image quality and construction, hand made to the highest quality.
AL : A lens that uses one or more aspherical elements to help improve wide angle performance and sharpness.
ED : A lens that uses extra-low dispersion glass elements reduces chromatic aberrations.
IF : A lens that uses an internal focusing mechanism.
SDM : Super Sonic in lens lens AF motors, silent and accurate Autofocus.
Fixed Rear Element Extension (FREE) : A lens whose last element group remains fixed during focusing.
SMC : Pentax’s lens coating technology.
Quick Shift : Allows manual adjustment of AF after AF lock has been achieved.
PZ : Power Zoom, and Electronic zoom function on KAF-2 mount FA lenses, only functional on Z series FSLRs and K10D digital body.
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