Originally posted by audiobomber I have the Sigma 530 Super. I haven't used it as a slave with Manual zoom, but I always drop the built-in diffuser for 17mm FOV in the umbrella.
Re X-synch, I have not noticed this behaviour. Since it's intermittent, I'm wondering if the Sigma just didn't get the signal from the weak built-in. The Sigma has a neat feature, you can angle the sensor in the flash body to face your controller. Give it a try, it may help.
Thanks for the suggestion, Dan. I did change the angle, but it was not until I switched back to manual and then back to X synch that I got the flash to work again. That part could also be something in the aging K20d I was using at the time. As I said, there could be other variables at work.
I was also not intentionally using the Sigma 610 with manual zoom, but it keeps defaulting there when I select all the other wireless settings. There may be some short cut to the wireless setting I'm missing. Here is where the Pentax flash is far superior. The middle position on the on/off switch selects wireless, and it could not be easier.