Canon Lenses

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Canon lenses use the following terms to indicate features of each lens:
Common
XYZmm: Focal length (e.g in 100mm lens 100 is the focal length)
f/x.y: Maximum aperture (e.g in f 2.8 or f 4 lens 2.8 and 4 are the maximum apertures in that particular lens)
Focus/Mount Type
EF: Electronic Focus
EF-S: Short-Back Electronic Focus
EF-M: Mirrorless Electronic Focus
TS: Tilt-Shift
TS-E: Tilt-Shift, Electronic aperture control
MP-E: Macro-Photography, Electronic aperture control

Features
IS: Image Stabilization
USM: Auto Focus Type: Ultrasonic Motor
STM: Auto Focus Type: Stepping Motor
(Mark) N: Version of lens (Mark II = v2, Mark III = v3, etc., word Mark may not be present)
DO: Diffractive Optics
L: Luxury series
Macro: close focusing, but not necessarily 1:1 magnification
Softfocus ability to use soft focusing for smooth dreamy look
Examples
Canon EF 16-35mm f/2.8 L II USM Lens
Canon EF 70-200mm f/2.8 L IS II USM Lens
Canon TS-E 17mm f/4 L
Canon EF 50mm f/1.2 L USM
Canon EF-S 10-22mm f/3.5-4.5 USM