Different between red dot and white dot at the Canon lenses?

[lee51333]

Hi newbie here, may i know what is the different between red dot and white dot which is found at the canon lenses?

 

[kangdi]

White square is for EF-S lenses, Red dot is for EF lenses.

http://en.wikipedia.org/wiki/Canon_EF_lens_mount

http://en.wikipedia.org/wiki/Canon_EF-S_lens_mount

 

[2pointEIGHT]

EF-S means its only able to mount of APS-C bodies, e.g 550D,60D,7D
EF means its able to mount on APS-C, APS-H, FF bodies, e.g 7D, 1D MK IV, 1Ds MK III.

 

[lee51333]

Thank you. Bro