I am planning to get a flash for my D90 just that I don't know which to get and I am totally new to the flash system. I am wondering between Nikon and Nissin (unless there are better recommendations).
I have a budget about $300+- (I don't mind 2nd hand prices too)? I don't know how decent the flash will be with this price but hopefully to get the best.
Last but not least I am wondering does every flash can work without mounting to the cam (eg. flash the light, or keep the light on the flash on until i off it)?
Feel free to cover more details I may be missing out.