Кстати вот самый свеой отзыв насчет новой Токины 28-80/2.8
на EOS форуме Фреда Миранды:

"I tried the Tokina 28-80ATX Pro f/2.8 with my Elan-7 and slow speed slide film. Two problems - there was a consistent front focusing problem, and second, the sharpness was not good wide open, and it needed to go down to f/5.6 or so for the sharpness to match my old 28-105USM."

Думаю это прояснит ситуацию...