Shutter Speed question

[Geoffrey Chandler]

I know this is a basic question but it's something I've never fully understood. Sometimes I switch to 60fps when I know I want a particular shot finished in slow-motion. What would happen if I forget to up the shutter speed to 1/125 and leave it at 1/60?

Thanks.

[Steve Bleasdale]

Hardly no difference Geoff, the slow motion when slowed down may not be as smooth as you, like due to the shutter speed but i cannot really tell when i have done this.

[Jay Massengill]

I don't have a Panasonic, but I've been shooting a lot of 60p footage lately under natural light, almost all of it at 1/60th of a second. I really like how smooth it is at half-speed rendered back to a 30p format. I haven't tried outputting to slower than half-speed though.

[Ron Evans]

Shutter speed controls the motion blur whatever the frame rate. It is just the time the sensor is collecting light. Faster shutter speed for faster action will freeze the action. Again whatever the frame rate. The issue comes if you use a fast shutter on a slow frame rate will result in very sharp images that obviously change leading to visible judder. Hence the 180 rule. Slowing down 60P at 1/60 shutter on a 30p timeline still having a 1/60 shutter for each frame exactly the same as if you shot 30p at 1/60. I like the smooth motion of 60P so do not edit at anything else even if I finish to interlace 60i. Pretty much everything at 1/60 as I am indoors most of the time. Faster shutter will likely be OK for 60P shooting and viewing as the frame rate is high enough to avoid judder to our eyes.

Ron Evans

[Geoffrey Chandler]

Great explanation. Thanks.