I have two questions relating to getting an off camera flash to trigger.
1. Cameras that have the ability to trigger (optically) an off camera flash, will the camera be able to trigger a flash that is being shot through a softbox or an umbrella? Does the camera hot shoe flash need to be able to "see" the off camera flash in order to trigger it?
2. What is the cheapest way to hook up an external flash to a camera so that you can guarantee it triggers with a cord, are there better cords than others?