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The Canon EF 100-300mm f/4.5-5.6 USM is a telephoto zoom lens built for easy portability.

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Pros

full frame

2 agree

well controlled geometric distortion, coma, CA and light falloff

2 agree

good build quality - metal mount, nice feeling material, comfortable zoom and focus rings

2 agree

great performance at 100mm - even wide open

2 agree

lightweight and compact - great for travel

2 agree

USM - quick, fast and accurate autofocus

2 agree

easy to find

2 agree

affordable price point

2 agree
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Cons

no image stabilization on a lens that would heavily rely on it

2 agree

poor flare control

2 agree

very weak aperture - F/4.5-5.6, poor for low light shooting, isolation of subjects with DOF

2 agree

mediocre optical quality - you get what you pay for (very poor corner resolution above 100mm)

1 agrees
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Edit

 

The Canon EF 100-300mm f/4.5-5.6 USM is a telephoto zoom lens built for easy portability. Five separate zoom groups are used to reduce the length to 4.8 in, and rear focusing keeps the zoom action internal. This means that the lens does not lengthen to zoom or focus, reducing the potential for damage when being transported. The lens does not rotate to focus either, allowing filters to remain in position. Autofocus runs quickly and quietly using an Ultra-Sonic Motor (USM) system, and zoom is handled through a standard ring-type control. The maximum aperture ranges from f4.5 to f5.6, depending on how zoomed the lens is. The focal length allows closer subjects as well, and proper clarity can be achieved when the subject is as near as 1.5 meters.

Features
  • Telephoto zoom lens
  • Rear focusing
  • Focal Length: 100-300mm
  • Maximum Aperture: 1:4.5-5.6
  • Lens Construction: 13 elements in 10 groups
  • Diagonal Angle of View: 24 deg - 8 deg
  • Focus Adjustment: Rear focusing system with USM
  • Closest Focusing Distance: 1.5 m, 4.9 ft
  • Zoom System: Rotating Type
  • Max Diameter x Length: 2.9 in x 4.8 in, 73 mm x 121.5 mm
  • Weight: 1.2 lbs, 540 g
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