Help with 30p shutter speed choices.

P

ProAmateur

Active member
Hey,

Okay so I am gonna try shooting some fast action stuff using 720 30p since the ultimate output will be web and its gets knocked down to 30 fps anyway. Just want to experiment a little.

So my question is about shutter speed. Its outdoors and light will not be a problem. Shutter off will mean 1/30, and I know that 1/60 would be an 180 degree setting. Will it do any good, or even make a difference to go up to 1/120? Or even 500 or 1000?

I know I am not going to get the silky smoothness on fast action that I get with 60p, but I am trying to minimize the loss when its converted to 30 fps for web distribution.

Thanks again everyone.

Regards,

G.

P.S. Oh yea, I know that 720 30p is over 60p, but I have completely given up on trying to get a handle on what that means. So, I am not even sure if the "over 60p" thing has any effect on the above question.
 
From what I've seen, the higher shutter speeds give you shaper video but it can look strobe-like at times when the action is faster.


Also I think the 30p frames are carried over 60i fields which makes it easier to edit in some older NLE but you don't get the interlaced “combs”.
However our 150's shoot 1080 - 60p and from that we record 1080p 1080i and 720p.... If that helps.
 
Hidef1080 said:
From what I've seen, the higher shutter speeds give you shaper video but it can look strobe-like at times when the action is faster.


Also I think the 30p frames are carried over 60i fields which makes it easier to edit in some older NLE but you don't get the interlaced “combs”.
However our 150's shoot 1080 - 60p and from that we record 1080p 1080i and 720p.... If that helps.
Click to expand...
The HMC150 doesn't record 1080 60p if it's what you meant. Only 60i, 30p or 24p.
 
This is from Panasonic for both the 170 and the 150:

High-Resolution Native Progressive 1080/60p Scan​
Progressive to interlace conversion, cross conversion and down conversion all start with the 1080/60p scan. That initial 1080p native progressive scan offers the highest level of vertical resolution possible at this level of camera. Keep in mind that the camera does not record this
signal but uses it as a basis for all captures. The result is an HD or SD recording with a level of image quality that cannot be matched by electronically processed scans.​
 
Very interesting, Hidef1080! If this is true, HMC150 is not capable of capturing 24p natively. Converting from 60p to 24p is very difficult and simply cannot be done 'right' (you have to either follow the easy path of dropping/merging frames or apply some frame interpolation algorithm which is very expensive in terms of computational complexity and cannot be done realtime in-camera, I guess). I've read some user reporting problems with HMC 24p strobing/stuttering, no matter what shutter speed they choose - this might be related somehow? I mostly shoot 25p (have HMC151) and haven't noticed such problems...
Maybe Jan could cast some light on this?
Wonder if HPX170, with its multiple framerates, starts with 60p as well? I just can't believe it...
 
Incorrect reading of it. The camera scans at UP TO 60p, not "always at" 60P. The CCD gets reclocked to whatever frame rate you need, whether it's 23.976 or 25 or 50 or 60.

There is no interpolation, no frame blending, etc. It scans at the actual exact rate that you specify, which can be as fast as 60p. The wording in the quote above is incomplete.
 
Barry_Green said:
Incorrect reading of it. The camera scans at UP TO 60p, not "always at" 60P. The CCD gets reclocked to whatever frame rate you need, whether it's 23.976 or 25 or 50 or 60.

There is no interpolation, no frame blending, etc. It scans at the actual exact rate that you specify, which can be as fast as 60p. The wording in the quote above is incomplete.
Click to expand...

I pulled that right from Panasonic.
No removing or changing the wording.
 
He included all of the wording...

20090527-ksukhxqf6xw9h9iie7txwgxshr.jpg


Link: https://eww.pavc.panasonic.co.jp/pro-av/sales_o/02products/products/ag-hmc150/ag-hmc150.html
 
It still seems like it saying from the initial 1080p that all other resolutions are coming from that.

But if I miss read it cool.
I'm not here to knowingly give out wrong info or get into a pissing match Jordan.
 
A pissing match? What the hell is wrong with you?

I simply posted the original information from Panasonic so Barry could see that what you said was in fact the original text. And you claim I want to get in a pissing match?

Someone needs a hug... ;)
 
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