Why the ball is not round on following crop:

enter image description here

SS = 1/60

What's going on?

  • 2
    \$\begingroup\$ The duplicate explains this as an effect of mechanical rolling shutter. Here, I bet it's because the electronic shutter was used. \$\endgroup\$
    – mattdm
    Commented Nov 23, 2015 at 15:42
  • 1
    \$\begingroup\$ It's not really the same question - this question is "Why is the ball not round" to which the answer is "Because of the rolling shutter effect". The marked duplicate is "What is the rolling shutter effect?" \$\endgroup\$
    – Steve Ives
    Commented Aug 25, 2016 at 11:53

1 Answer 1


For me it looks like rolling shutter effect. For more detailed explanation what is this you can check here

  • \$\begingroup\$ Rolling shutter at 1/60? What is the sync speed of the camera? \$\endgroup\$
    – Michael C
    Commented Nov 24, 2015 at 9:12
  • \$\begingroup\$ @MichaelClark, see the effect in video (30 FPS probably): youtube.com/watch?v=LVwmtwZLG88 And in photo in question we have movement in opposite directions which make the relative speed much faster \$\endgroup\$ Commented Nov 24, 2015 at 10:41
  • \$\begingroup\$ 30fps does not necessarily equal a shutter speed of 1/30 second. The time the sensor is collecting photons could be much shorter. And the movement here is in the same direction. Images projected by the lens are reversed/mirrored on the sensor: the top of the sensor is the bottom of the image and vice versa. Ball is going up and the sensor is reading out from top of sensor/bottom of image to bottom of sensor/top of image. \$\endgroup\$
    – Michael C
    Commented Nov 24, 2015 at 11:54

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