Sim-Cam

F2.8 - looks the best at 1/125th of a second shutter speed.

F4 - looks best at 1/125th of a second shutter speed.

F5.6 - looks best at 1/60th of a second shutter speed.

F8 - looks best at 1/60th of a second shutter speed.

F11 - looks best at 1/30th of a second shutter speed.

F16 - looks best at 1/15th of a second shutter speed.

F22 - looks best at 1/8th of a second shutter speed.

F2.8 there is no background visible - it is very blurry and all you can really see is the couple.

F4 there is a background but it is very blurry

F5.6 the background is slightly clearer but still blurry

F8 the background is more clear

F11 the background is getting clearer and darker

F16 the background is getting clear but also darker and blurry

F22 the background is very clear and precise

At the slower shutter speeds, the people are getting more and more blurry and brighter, but the photographer could fix this by using a lot of natural light so that way you can use higher shutter speeds and get clearer pictures.  I think the lowest shutter speed a photographer can hand hold the camera is 1/125th of a second.