i think 24-105L price higher than af24-85f2.8-4 is for the IS feature and 四角失光 would happen when you use it on FF only.This is a general issue,this issue would also happen if you use AFD24-85 on D3 anyway.
i have to say sorry to all members here which they feel unhappy with this discussion.I am not going to attack anyone and just to share my view only.let s' have another happy discussion ok?
* 10.1 MP CMOS sensor
* Up to 3fps
* 7-point wide-area AF
* Self-Cleaning Image Sensor
* 2.5” LCD with Live View mode
* DIGIC III processor
* SD/SDHC card slot
* Picture Styles processing
* Compact and lightweight
* Compatible with EF/EF-S lenses and EX Speedlites