OVERCOME FLASH CHALLENGES
Use of studio flashes can create problems when experimenting with wide apertures for shallow DOF
DSLRs have a maximum shutter speed at which they can effectively synchronise with flash lights. if a shutter speed above approximately 1/200sec is selected, depending on the camera model, the setting will either reset to that maximum speed or the image will be rendered with uneven brightness, due to the shutter curtain appearing in the frame. if a wide aperture is used this creates a problem, since exposure duration cannot be used to reliably control image brightness – if the flash light is already at the lowest output, overexposure may occur with the lens wide open. a solution is to use a circular nd filter on your lens to cut light intensity, before it enters the camera. screw-in filters are preferable to square systems in this case, for more convenient handheld shooting.
LeftLIMITED CONTROL AT THE LENS’ WIDEST APERTURE IN THE OUTDOOR ENVIRONMENT, THE REQUIRED SHUTTER SPEED EXCEEDS THE MAXIMUM FLASH SYNC SPEED, RESULTING IN FRAMEWIDE OVEREXPOSURE
LeftFILTERED IMAGE WITH THE AID OF A VARIABLE ND FILTER, SET TO AROUND ONE STOP OF LIGHT REDUCTION, THE LOCKED MAXIMUM SHUTTER SPEED IS NOW SUFFICIENT TO CREATE A BALANCED EXPOSURE