Sony FX 6 Quick Start Manual page 149

S and Q: shutter speed VERY IMPORTANT
When you switch to S & Q mode it does not pick the correct shutter speed
for you. The shutter speed will match the frame rate. This is not correct!
Change the shutter speed.
Remember that when shooting standard motion or slow motion, the shutter
speed should be set to double the frame rate for a normal amount of
motion blur in the image.
So, if your S & Q rate is set to 120 fps, the shutter speed must be adjusted to
1/240 th of a second or, in this case, 1/250 th of a second because 1/240 th is
not an option on this camera.
With faster shutter speeds you need more light to expose the image!
See the next page for images.