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Lens Dictionary

Following table displays lens technologies used and comparison between similar features and markings among different manufacturers. Detailed descriptions of technologies can be found on separate pages for each lens manufacturer.

  Canon Nikon Sigma Tamron Olympus Pentax Sony
image
stabilization
IS
(Image Stabilization)
VR
(Vibration Reduction)
OS
(Optical Stabilizer)
VC
(Vibration Compensation)
     
focusing
motor
USM
(Ultrasonic Motor)
SWM
(Silent Wave Motor)
HSM
(Hyper-Sonic Motor)
USD
(Ultrasonic Silent Drive)
SWD
(Supersonic Wave Drive)
SDM
(Supersonic Drive Motor)
SSM (SuperSonic Motor
SAM (Smooth Autofocus Motor)
focusing
technology
Floating System
IF & RF (Inner & Rear Focusing)
IF (Internal Focusing)
RF (Rear Focusing)
IF (Inner Focus)
RF (Rear Focus)
IF (Internal Focusing)      
professional
series
L (Luxury)   EX Lens SP (Super Performance)   DA* G (high quality)
ZA (Zeiss-designed)
full frame /
crop (APS-C)
EF (full frame)
EF-S (crop only)
DX (crop only) DG (full frame)
DC (crop only)
Di (full frame)
Di-II (crop only)
    DT (crop only)
glass technology Aspherical Lenses
Fluorite and UD Lenses
DO (Diffractive Optics)
ASP (Aspherical lens elements)
ED glass (Extra-low Dispersion)
ASP (Aspherical Lens)
APO (APO Lens)
LD (Low Dispersion)
XR (Extra Refractive Index glass)
    APO (Apochromatic correction)
HS-APO (APO with higher-speed)
glass coatings Super Spectra Coating SIC (Super Integrated Coating)
N (Nano Crystal Coat)
        T* (Carl Zeiss coating)
tilt / shift TS (tilt shift) PC (Perspective Control)          
manual focus Full-Time Manual Focus M/A mode          
other
technologies

CRC (Close-Range Correction system)
DC (Defocus-image Control)
D (Distance information)
G (G-type)
Conv (APO Teleconverter EX) ZL (Zoom Lock)     STF (Smooth Transmission Focus)
(D) Distance encoder
(xi) Motorized zoom