Normally I would use shutter speed to control the lighting outdoors but with strobes I can only use 1/160 because of sync speed. Aperture controls DOF but with strobes it also controls the amount of light hitting the sensor. I can overcome this by increasing or decreasing power so this is not a great issue. But I want to shoot in bright conditions and a shutter speed of 1/160 and an aperture of 2.8 or bigger causes the background to blow out. If I wasn't using flash my shutter speed needs to be 1/3200 or more. So how do I use aperture at 2.8 or 1.4 and shutter speed of 1/160 and still keep the background from blowing out? Do I need to pick up a ND filter? I would need a 5 stop filter?