The EF 100-300mm refers to three telephoto zoom lenses produced by Canon. They are of the EF lens mount that is compatible with the EOS line of cameras.
The three versions are:
| Attribute | f/5.6 | f/5.6L | f/4.5-5.6 USM |
|---|---|---|---|
| Image stabilizer | No | ||
| Ring USM | No | Yes | |
| L-series | No | Yes | No |
| Diffractive Optics | No | ||
| Ultra-low dispersion glass element | No | Yes | No |
| Synthetic Fluorite glass element | No | Yes | No |
| Macro | Yes | ||
| Short back focus | No | ||
| Maximum aperture | f/5.6 | f/4.5 - 5.6 | |
| Minimum aperture | f/32 | f/40 | |
| Weight | 685g | 695g | 540g |
| Max. Diameter x Length | 75 mm x 166.8 | 75 mm x 166.6 mm | 73 mm x 121.5 mm |
| Filter diameter | 58 mm | ||
| Horizontal viewing angle | 20°'- 6° 50' | ||
| Vertical viewing angle | 14°'- 4° 35'° | ||
| Diagonal viewing angle; | 24°'- 8°15' | ||
| Groups/elements | 9/15 | 10/15 | 10/13 |
| # of diaphragm blades | 8 | ||
| Closest focusing distance | 2 m | 1.5 m | |
| Release date | March 1987 | June 1987 | June 1990 |
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