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View Full Version : Shutter Speeds, once and for all?



awelgraven
10-06-2009, 06:55 PM
I've seen different answers all over the place. I understand that for 1080 24p footage, the shutter should be 1/50th for the most filmic shutter effect.

But for the 720p 60p option, I've heard and read all sorts of varying things. I plan on dropping said 60p footage into a 24p FCP timeline.

So far I've read that for a filmic shutter speed for said settings, I should use:
1/50
1/60
1/120
1/125

Is there a definitive answer for which one I should be using? Sorry if I'm rehashing and old topic. I did search, I just couldn't find one for sure answer, it would seem. For example, on the hot rod gh1 camera guide, it says "Adjust the Shutter Speed to 1/50 for [FHD] and 1/125 for [SH] mode."

I've never seen the 1/125 anywhere else but there, but he seems to know what he's talking about. So idk... :cry:

Barry_Green
10-06-2009, 08:19 PM
NEVER EVER EVER use 1/50 for 720/60p. You will end up dropping your frame rate to 30 fps!

The standard shutter speed for the "video" look is 1/60 for 720/60p. Also, if you plan on donig a post conversion of 720/60p -> 720/24p, you'd want to have used 1/60.

If you're planning on using your 720/60p footage as slow-mo on a 24p timeline, use either 1/120 or 1/125 (it really doesn't matter).

awelgraven
10-06-2009, 08:20 PM
Thank you thank you!

DavidH977
10-06-2009, 08:36 PM
Thanks for posting this. I too learned something. I have more questions but for the life of me cannot figure out how to start a thread. I feel so dumb because I feel to do so is right in front of me

Jack Daniel Stanley
10-06-2009, 08:41 PM
Here David:
http://www.dvxuser.com/V6/picture.php?albumid=182&pictureid=1841

Kerplunk
10-07-2009, 02:30 AM
If you're planning on using your 720/60p footage as slow-mo on a 24p timeline, use either 1/120 or 1/125 (it really doesn't matter).

Is 1/120 a PAL thing? Because I don't see it on my NTSC GH1. Thanks.

senomar
10-07-2009, 05:16 PM
i know people say "never ever ever" and all that... but if you're in a very low light situation, sometimes the shutter effect is more desirable than high iso noise... and as far as I can tell, when captured by FCP, it still comes out 60p, which is conformable in Cinema Tools for slow mo... i'm just saying... what's the big deal? is it a x-fer to film compatibility thing?

Barry_Green
10-07-2009, 05:21 PM
Well I say "never ever" because your footage will no longer be 720/60p. It'll be 720/30p, embedded within 60p.

Now, with that said, if you're fully aware of what it's going to do to your footage and you still feel the low light gain of changing the shutter is worth dropping your frame rate in half, then sure, go right ahead. Just do so with full knowledge of what it's going to do to your video.

Cranky
10-07-2009, 05:23 PM
i know people say "never ever ever" and all that... but if you're in a very low light situation, sometimes the shutter effect is more desirable than high iso noise... and as far as I can tell, when captured by FCP, it still comes out 60p, which is conformable in Cinema Tools for slow mo... i'm just saying... what's the big deal? is it a x-fer to film compatibility thing?
It is 60p. with frame repeat. If you are ok with that, then no prob. Just don't forget that you will not have 60 unique frames per second with shutter speed slower than 1/60. If you are in the low light situation, 1/30 may make sense, who cares that effective frame rate drops to 30fps. But difference in exposure between 1/50 and 1/60 is not worth losing half a frame rate. IMHO.

Jack Daniel Stanley
10-07-2009, 05:30 PM
It's not so bad if you want to stay at 720/60
(though it will really be 30p as others have said - frame by frame your 720/60p shot qt 1/50th and you will see frame doubling)

The problem is when you convert to 24p. 30p does not convert as well to 24p and that's what you have now really. For some movement you won't notice the difference. Smooth movement (movement that should be smooth like a car driving by or a boat gliding across the screen) will look jerky and awful.

See it here:
http://www.dvxuser.com/V6/showthread.php?t=175852