I am at my wits end trying to get my brand new 24 - 240 Lenes to auto extend when focusing, the kit lenes doesnt either but my tamron with a canon adapter does , Im sure all settings are right , I so hope someone has and idea.
i think the oddity there is the tamron rather than the others, not many inte changable lenses do auto zoom as they dont have the motors in them to do that, all the ones i have canon, sigma etc are manually operated zoom. which tamron lens do you have that does auto zoom?