30p question.

J

JakeTheSnake

Member
I normally shoot in 60i to film skateboarding, however i'm unhappy with the way the video turns out after post. I mean don't get my wrong, it looks great, but shooting in progressive looks much better and is easier when uprezing.

So today i shot in 30p and the footage looks good.
The only thing is, it was just a LITTLE bit stroby.
I know it's supposed to do this, but im wondering what the best shutterspeed/synchro scan would be for 30p mode shooting fast motion.

Today i shot in 30p with Shutterspeed at 1/1000 to eliminate motion blur.
i think maybe 250 or 500 would be better but i just wondered if anyone could tell me so i dont have to go waste more footage looking for the right settings.

Thanks.
-jake
 
I would even consider trying 1/120. Keep in mind that the "standard" shutter speed is between 1/40 and 1/60, so 1/1000 is going to have much more of a strobe effect.
 
if you are going to keep it at regular speed, go 1/60. If you want more definition of those tre flips, I would set it at 1/120(this also creates super smooth, filmish slow motion when slowed down to 80% without frame blending on a 29.97 timeline).

1/1000 is friggen' unnecessary. I have never needed to go past 1/120, even for high-speed subjects. The goal isn't to eliminate motion blur completely, because that looks artificial and stroby. The goal is to find the right balance between motion blur and definition. Too much of either generally looks weird, which may or may not be what you're after...
 
Last edited:
It actually occured to me that 1/1000 speed would/should make it more strobey...i just wanted to make sure.

And that's exactly what i needed righteous. thanks a zillion man.

Next time we film i'll be sure to post a montage and show you how it turns out.
 
Yeah man.

I don't mean to plug my own video, but this video was shot at 24p 1/60, and 30p 1/120. You can clearly see which shots are 24p (indoors, rail follow cams), and there is lots of 30p 1/120 footage played back at regular speed (barrel taps, tree taps). The last shots on the jumps were 30p 1/120 using the 80% slow down method. Hope this gives you an idea.

http://www.vimeo.com/10045672

As you can see, there is a LITTLE bit of motion blur to keep it natural looking, but I've tamed it enough to give definition. Most people recommend 1/48 shutter for 24p, but I found this too streaky for my tastes, so I upped it to 1/60. There will always be guidelines, but that are just that, guidelines. As you progress as a filmer, you will know which changes to make in order to suit your personal preferences. For all I know, everything I've just told you could be not at all what you're looking for...
 
Last edited:
http://www.youtube.com/watch?v=QDjr-fdi0aE
This is my latest footage. It was actually close to what i was looking for. On the regular speed shots everything looks great. I shot 30p with 1/120 shutter the whole video.
I think next time i'm going to shoot 1/250 shutter for the slow mo...
The slow section in this video is probably too slow, i just wanted to put it to the music, and that was the best way lol.
but anyways, i'd love to know what you think.
It's also upresed XD
 
JakeTheSnake said:
http://www.youtube.com/watch?v=QDjr-fdi0aE
I think next time i'm going to shoot 1/250 shutter for the slow mo...
The slow section in this video is probably too slow, i just wanted to put it to the music, and that was the best way lol.
but anyways, i'd love to know what you think.
It's also upresed XD
Click to expand...

Looking good! Although the reason why I recommended 1/120 for slow motion, is because it creates a progressive slow motion (40ish fps if I remember correctly; check your Barry's DVX book) when slowed to exactly 80% without frame blending on a 29.97 timeline. Shooting 1/250 would work, but if you're the type who likes to know their frame rates instead of just randomly slowing things down, then perhaps you would like that route more?
 
No, the reason you'd be concerned with the shutter speed when going for slo-mo is so that it ends up matching the shutter speed of the other footage. It has nothing to do with it being progressive or interlaced.

A typical shutter speed for 24 fps, for cinematic film, is 1/48. It's actually 180 degrees on a film camera, but the upshot is that that the iris is open and light is coming through for half the time the frame is being exposed.

At 24 fps, that's 1/48th of a second for each frame.

So, if you're going to shoot at a different rate and slow it down to 24 fps, you want that footage to have each frame exposed for half the time, too. For 60i, that's 1/120. For 30p, that's 1/60. The upshot is that at the same iris setting, the footage will have the same brightness (because shutter speed affects it) -- and also a similar motion blur.
 
You must log in or register to reply here.
Back
Top