I have the 58 MB AF2 tested immediately after delivery, as a photographer at a wedding. 1900 pictures with my Nikon D90 of ca 1500 with flash. All images superbly illuminated. Series pictures were not a problem. Over the entire zoom range (105s lens) super pictures! Total of 4 sets of 4 x AA (2700) battery consumes. So about 375 images per battery set, they have also not geblitz completely empty! I'm really excited! Would buy it again and again !!!