I currently am using the Nikon D3400 however, every time I use my flash the shutter speed is restricted to 200. As I am mainly shooting bikes (BMX & MTB) so my shutter speed needs to be high and the subject well light. Without my flash I get really grainy images due to the high iso and with my flash I get blurred images as the subject is moving too fast to be captured at 1/200. If anyone could give me any guidance that would be really appreciated.