Gianna'sPapa
DIS Veteran
- Joined
- Aug 16, 2008
- Messages
- 3,977
I have been using the Sigma 530 series (ST and Super) on our cameras for the past several years. I have no complaints. The 610 series (according to a tech at Sigma) is the same as the 530 series except it is more powerful. The Pentax flash has not been upgraded in several years and is less powerful than the Sigma. I prefer the Sigma Super model because it has the wireless trigger and all the controls on the back. The ST is a more basic model with a swivel head and you use your camera menu to control the flash. Both flashes will do the job for you.