Hi, Can I ask someone for some help with shutter speed. I have been told in the past that the shutter speed should be double the frame rate, 50p = 1/100. However, on the PX270 when in 1080p 50fps the closes options it allows is 1/60 or 1/120, I am confused as what should I set my shutter on. I have been playing with the shutter scan mode which allows 99.9 or 1/100.1 but not certain if I should be playing with that just yet? I would appreciate any advice, maybe 1/120 is fine? Thank you
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Panasonic PX270 Shutter help
- Thread starter Agent M
- Start date
Barry_Green
Moderator
The proper shutter speed for video footage should be the reciprocal of the frame rate. So for 50p, it should be 1/50. For 60p, it should be 1/60th.
The "double the frame rate" suggestion is for when you're trying to simulate the look of film with a 180-degree shutter. This means 1/48.0 for 24 fps, or 1/50 for 25 fps. But it should not be used for conventional video footage (such as sports coverage or live presentations) as it would look jitterier than what people expect.
The "double the frame rate" suggestion is for when you're trying to simulate the look of film with a 180-degree shutter. This means 1/48.0 for 24 fps, or 1/50 for 25 fps. But it should not be used for conventional video footage (such as sports coverage or live presentations) as it would look jitterier than what people expect.
Hi Barry, thanks very much for the response. What I am trying to explain (poorly) is that there doesn't seem to be correct shutter setting when shooting in 50Hz. The factory presets are 1/60 or 1/120th which are 60Hz. Unless I go in to Synchro Scan and select by increments of 0.1, which takes ages to get to 1/100th, surely this is not correct.
Sorry still a little confused are you saying if I shoot 1080p 50fps I should be shooting on 1/50th not 1/100th?
I can select 1/50th in shutter scan mode but surely I shouldn't have to go in to that selection to set it. If the shutter speed is reciprocal of the fps then 25p should be 1/25th that surely isn't correct? I was shooting 1/50th with 25i on my old Sony Z1? I would appreciate and technical knowledge you might have on this. Many thanks
Sorry still a little confused are you saying if I shoot 1080p 50fps I should be shooting on 1/50th not 1/100th?
I can select 1/50th in shutter scan mode but surely I shouldn't have to go in to that selection to set it. If the shutter speed is reciprocal of the fps then 25p should be 1/25th that surely isn't correct? I was shooting 1/50th with 25i on my old Sony Z1? I would appreciate and technical knowledge you might have on this. Many thanks
Last edited:
Barry_Green
Moderator
What I am trying to explain (poorly) is that there doesn't seem to be correct shutter setting when shooting in 50Hz.
Well, again, it depends on what type of footage you're trying to shoot. If you want the "film look", and are shooting 50p for slow motion playback in a 25p project, then that is about the only time you would want to use 1/100. And if that's what you want, then you can definitely get it, what you do is set the synchro scan shutter type to "deg" for angle of degrees, and then set the synchro scan value to 180.0. That will give a shutter angle twice the frame rate, no matter what frame rate you set.
But again, that's only for shooting 1080p (or 720p) for the film-type look, and the only time you'd use that with 50p would be when you're shooting for slow motion.
Sorry still a little confused are you saying if I shoot 1080p 50fps I should be shooting on 1/50th not 1/100th?
Absolutely. If you want to shoot video footage that looks like video footage (aka "reality") then you most definitely DON'T want to go using 1/100 or any other fast shutter speed. You'd use the shutter speed that's the same rate as your frame rate, so for 50p you'd want 1/50.
I can select 1/50th in shutter scan mode but surely I shouldn't have to go in to that selection to set it.
You don't have to. Just turn the shutter to "off" and, when in 50p, it'll be set to 1/50th.
It is correct for video (which is shot at 60p/60i or 50p/50i). The "video" look is never shot at 25p/24p, that is used for the "film look", and when shooting the film look, you'd use double the frame rate to simulate the actions of a 180-degree shutter. So, whenever shooting for the film look, it's easiest to set the synchro scan to "deg" and set its value to 180.0.If the shutter speed is reciprocal of the fps then 25p should be 1/25th that surely isn't correct?
Ah, perhaps the root of the problem -- 25i is an evil and deceptive lie. There is no such thing. You were actually shooting 50i on that Z1 (50 interlaced fields per second); some people insist on calling that "25 frames" but it categorically is not, and a simple glance at 25p footage will show why; there's a vast huge difference in the look of the two. Interlaced video at 25 "frames" per second is, in actuality, 50 half-frames per second. The motion sampling takes place at 50 fps, and it acts in all ways as if it was 50fps, except when editing for some reason we got crammed into having to put two separate half-frames together into one "interlaced frame". It's counterintuitive, and I am soooo glad to see that we're finally at the point where interlaced is in its death throes; it'll cling to us a while longer (like crap clings to a bear's butt fur) but eventually it will dry up and fall off and never be seen or heard from again, and will be exterminated and replaced with 1080/50p and 1080/60p. Thank the heavens and the lucky stars that there is no 4K interlaced system proposed or existing (that I know of!)I was shooting 1/50th with 25i on my old Sony Z1?
So -- 1/50 was absolutely the right shutter speed for interlaced video on a Z1. Just like it is the right shutter speed for 1080/50p footage on a PX270. The footage will look similar (in terms of motion rendition), which -- if you're shooting video footage, that's the proper shutter speed to deliver the look you're after.
Hi Barry, thank you so much for a very informative and helpful response, I really appreciate you taking the time to relay all that information. I had a stress headache trying to understand what the heck was going on. I can now feel much more confident that I am shooting my footage in the correct settings. Kind regards