if u r using 2500mhz batt...should be last u more than that...580ex can last me more than 500 shots within an hours...sunnyday said:he mentioned that he got a95 oso..probably 4 for that..then 4 for the flash..n 4 as spare..
btw new alkaline batt on 420EX..can last how many shots??50 can tahan??