Tokina 11-16 2.8 AF problems...help!!!
I bought new tokina 11-16 2.8 for my canon 40D... At first I was impressed by this lens because it is really sharp... But then I want to use it in club in low light condition with flash... When is dark AF beam stars working(red light in speedlite which helps to find focus....)...there is a problem...when AF-beam works I always gets back-focused photos...I do not know why because I newer had problems with my tamron 17-50 2.8.... Then I tried to focus with built-in flash with tokina and it works!! ... so I do not know where could be a problem so I will be grateful if anyone who owns tokina and canon body can told me what could be a problem...
So here are few samples:
At good light(sunny):
And comparison between tamron 17-50 @ 17mm f2.8 and tokina 11-16 @ 16mm f2.8
focusing with built-in flash:
And focusing with speedlite 430ex mk2 (AF-beam)
So please help!!!