School - Dictionary

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A-M	A-M switch	Nikon	More information
A/M	A/M mode	Nikon	More information
AD	Anomalous Dispersion	Tamron	More information
AF-S	Autofocus-Silent	Nikon	More information
AF/MF	Auto-focus/Manual-focus (AF/MF) Switch Mechanism	Tamron	More information
APO	Apochromatic	Sigma	More information
APO MACRO	Apochromatic Macro	Sigma	More information
AS	Aspherical lens elements	Nikon	More information
AS	Aspherical Optics	Tokina	More information
ASL / Asph	Aspherical	Tamron	More information
ASP	Aspherical Lens	Sigma	More information
CONV	APO Teleconverter EX	Sigma	More information
CRC	Close-Range Correction system	Nikon	More information
D	Distance information	Nikon	More information
DC	Defocus-image Control	Nikon	More information
DC	DC for Digital	Sigma	More information
DF	Dual Focus	Sigma	More information
DG	DG for Digital	Sigma	More information
DI	Digitally Integrated	Tamron	More information
Di-II	Digitally Integrated (APS-C)	Tamron	More information
DX	APS-C format for Nikon	Nikon	More information
ED	Extra-low Dispersion	Nikon	More information
EX	EX Lens	Sigma	More information
F & R	F&R Aspherical	Tokina	More information
FC	Focus Clutch Mechanism	Tokina	More information
FE	Floating Element System	Tokina	More information
FEC	Filter Effect Control	Tamron	More information
FTM	Full Time Manual Focus	Tamron	More information
G	G-type Nikkor	Nikon	More information
HID	High Index / High Dispersion Glass	Tamron	More information
HLD	High-refraction, Low Dispersion	Tokina	More information
HRI	High Refractive Index	Nikon	More information
HSM	Hyper-Sonic Motor	Sigma	More information
IF	Internal Focusing	Nikon	More information
IF	Inner Focus	Sigma	More information
IF	Internal Focus System	Tokina	More information
IF	Internal Focusing System	Tamron	More information
IRF	Internal Rear Focus System	Tokina	More information
IS	Image Stabilization	Canon	More information
LD	Low Dispersion	Tamron	More information
M/A	M/A Mode	Nikon	More information
MC	Multi-Coating	Tokina	More information
ML	Meniscus Protective Lens	Nikon	More information
N	Nano Crystal Coat	Nikon	More information
One Touch FC	One Touch Focus Clutch Mechanism	Tokina	More information
OS	Optical Stabilizer Function	Sigma	More information
PZD	Piezo Drive	Tamron	More information
RD	Rounded Diaphragm	Nikon	More information
RF	Rear Focusing	Nikon	More information
RF	Rear Focus	Sigma	More information
SD	Super Low Dispersion	Tokina	More information
SIC	Super Integrated Coating	Nikon	More information
SP	Super Performance	Tamron	More information
STM	Stepper Motor	Canon	More information
SWM	Silent Wave Motor	Nikon	More information
USD	Ultra Sonic Drive	Tamron	More information
VC	Vibration Compensation	Tamron	More information
VR	Vibration Reduction	Nikon	More information
WR	Water Repellent Optical Coating	Tokina	More information
XLD	Extra Low Dispersion	Tamron	More information
XR	Extra Refractive Index Glass	Tamron	More information
ZL	Zoom Lock	Tamron	More information

Top list
Our four most popular lenses (see all)
	Tamron AF SP 70-300mm f/4-5,6 Di VC USD
	Canon EF-S 55-250mm f/4-5,6 IS II
	Tamron AF 18-270mm f/3,5-6,3 Di II VC PZD
	Nikon AF-S DX 35mm f/1,8 G

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Lenses for Canon
Here are a few popular alternatives (see all)
	Sigma 8-16mm f/4,5-5,6 DC HSM
	Sigma EX 24mm f/1,8 DG ASP Macro
	Canon EF 35mm f/2 IS USM
	Canon EF 135mm f/2 L USM

School
Our articles will educate you (see all)
A lens is born
Focal length and field of view
Tripod Mounts
See pictures taken with a certain aperture value

Lenses for Nikon
Here are a few popular alternatives (see all)
	Sigma EX 70-200mm f/2,8 II APO HSM DG Macro
	Tamron SP AF 90mm f/2,8 Di Macro
	Sigma 18-250mm f/3,5-6,3 DC OS HSM
	Tokina AT-X Pro 16-50mm f/2,8 DX