can you LOCK your shutter speed to 1/60? and what shutter for 720p 60fps??

[Gene Sung]

Just out of curiosity, can you LOCK your shutter speed so it can't be changed accidentally. Sometimes after fiddling with the ISO and whatever else, I'll fire off a shot and later notice that I accidentally changed the shutter speed. So it would nice to be able to lock it to 1/60

Also, since Barry Green says to never change the shutter from 1/60. What about shooting 720 60fps? I've shot it at 1/120, but I have notice that it seems a bit stuttery.

For 720p 60fps, are you guys just leaving the shutter at 1/60?

 

[joossiej]

1/120th is the way to go.
The reason why it's "normal" to shoot 1/60th is because of the 180 degree shutter that's used in film. To emulate that, you need to "double" your shutterspeed according to your fps.

So the "normal" settings are:
30fps: 1/60
24 fps: 1/50 (because 1/48 isn't supported)
25 fps: 1/50

60fps: 1/120
50fps: 1/100

By using the "wrong" shutter speeds you get an artistic effect, experiment with it!

 

[studio1972]

If you are intending to convert to a different format for output (e.g. 50p to 25p DVD) then you may be better filming your 50p at 1/50 rather than 1/100. Also in low light situations 1/25 can be useful.

 

[Samuel H]

you want 1/120 (or 1/125) for standard 180º shutter motion blur at 60p, but that may cause problems with light flickering

about what studio1972 says:
if you're going to convert 50p to 25p by dropping half of your frames, then yes, use 1/50 for standard 180º shutter motion blur at 50p
if you're overcranking for slow motion, then you want 1/100 for standard 180º shutter motion blur at 50p