Abbreviation: EF-S = "Electro-Focus Small Image Circle" (Canon)
The abbreviations means "Electro-Focus Small Image Circle"
Explanation from Canon
EF–S lenses are specifically designed for EOS DSLR models with a more compact sized sensor – delivering lenses that are lightweight, versatile and supremely portable. With the EF–S range, Canon’s engineers took advantage of the APS–C sensor size to produce lenses that are not only lighter and smaller, but also offer photographers far greater wide-angle choice. Owners of EF–S mount cameras have access to a complete offering of lightweight lenses extending from 16mm to 400mm (35mm equivalent).
See examples of effected products
|Canon EF-S 18-200mm f/3,5-5,6 IS|
|Canon EF-S 55-250mm f/4-5,6 IS II|
|Canon EF-S 17-55mm f/2,8 IS USM|