I bought this flash to serve as a basic PTTL flash (before getting interested in studio work). So far I've used the Pentax AF280T in auto mode and decided to upgrade to a more powerful flash, zoom head and AF-assist illuminator. Including Sigma 530 DG ST. First impression: very well made, seems stable enough, looks better than some Yongnuos I've seen. The AF280T feels great, but the Sigma is just as well built, just as light, albeit larger. The Vivitar 285HV is bigger and heavier and appears to