FF means camera like 5d2..... EF-S can't be mounted on FF DSLR. 15-85mm is only for APS-C camera. IQ= Image quality 15-85 on APS-C almost == 24-105 on FF camera. But 15-85mm is newer than 24-105 and with better IS and IQ. It is a good lens.
【在 p***e 的大作中提到】 : FF means camera like 5d2..... EF-S can't be mounted on FF DSLR. 15-85mm is : only for APS-C camera. : IQ= Image quality : 15-85 on APS-C almost == 24-105 on FF camera. : But 15-85mm is newer than 24-105 and with better IS and IQ. It is a good : lens.