Wasn't sure if I should post this in the film photography thread or this one.. Ive got some questions about the flash that came with my GA645. Its a non-ttl flash and I'm unexperienced when it comes to using flashes. I understand I should use manual mode on the camera while using the flash, and if I am using 100 iso film on A1, I would shoot at F4, and if I use A2, I should shoot at F8, as the guide on the back of the flash says. What I'm confused about is what shutter speed I should use. I believe since the camera uses a leaf shutter, it can sync at all speeds. I would like to use a fast shutter speed because I am shooting skateboarding. I am also confused about the manual mode thats on the flash. I'd like to get a better understanding of the flash before I waste filming testing it out.
Here's a photo of the back of the flash:
Thanks for the help!