Werner Wesp |
November 20th, 2006 01:52 AM |
I watch F1 all the time, and those super slo-mo shots of the tyres in the chicanes definately are made with a higher shutter then the frame rate. Don't know what the frame rate is, but it could be as high as 400. By the way. a high shutter speed is just the thing for sports. Otherwise you'd lose the sharpness due to motion.
In sports, shutter speeds are dictated by the action rather then by the filmic result....
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Originally Posted by Stephan Ahonen
This is just plain wrong, it depends on the deinterlacing method. A bob, which most tape decks use, will effectively create half-res 50/60p. Adaptive deinterlacing and motion compensation can create what appears to be full-res 50/60p. Field Blending is the only deinterlacing technique which would result in half-res 25/30p.
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Well, I'm not saying there aren't better methods of deinterlacing, but you always have a starting point with just half the information. You can blend, you can interpolate, ... and the results will indeed be better then 'just' cutting the resolution in 2....
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Originally Posted by Stephan Ahonen
Again, incredibly wrong. Watch a sports broadcast some time, 99% of the slomo you see is shot by cameras operating at a native 1/50 or 1/60 shutter. Yet that slomo does not look any less "natural."
Because you are living in your own very tiny indie film world while completely ignoring the fact that people use this camera for other things. Remember that the 50p and 60p capabilities of this camera aren't simply for being able to shoot slomo, but primarily for being able to shoot at the native frame rate of the broadcast HD standard of your country. Being able to slomo it for 24p is just a bonus. Shooting video for broadcast requires the look resulting from a frame interval shutter speed
You have obviously never shot sports highlights. I invite you to go to a hockey game and shoot from the glass and tell me that 25p is fine. Because this sort of situation is exactly why I waited for the HD250 over the HD100.
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Actually I have. And it's a bitch. 25p isn't the ideal format to shoot sports in, but it can be more then fine. Most people won't even notice. If you're doing ENG and can't have full control of your framing and POV when shooting, 25p will make it almost impossible to get nice fluent shots. Still, Newscasting isn't what this camcorder is aimed at...
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Originally Posted by Stephan Ahonen
Because you are living in your own very tiny indie film world while completely ignoring the fact...
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Besides - no reason to get personal...
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Originally Posted by Stephan Ahonen
Wow. You don't even know how your camera works. Not only is your argument irrelevant (we're talking about shooting at the reciprocal shutter speed of the frame rate, not saying that 1/50 is the "ideal" shutter speed), when shooting at 1/12.5 the camera is shooting at 12.5 frames per second and pulling that frame down over 4 50p frames. You are not shooting "25p with a 1/12.5 shutter", you are shooting 12.5p. If it were actually physically possible to shoot with a shutter speed longer than the frame interval, the effect would be of motion blur from adjacent frames overlapping. From a temporal resolution standpoint it probably would be pointless to shoot that way, but it could be a rather interesting effect if you want maybe a "dreamy" sort of look. After I submit this post I'll work up a demo in my 3D software, which does allow these sort of weird shutter effects.
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This is EXACTLY the point I was making. Shooting 100p at a shutter speed of 50 doesn't make any sense, because it is like shooting 50p (you should've know this if you actually read my post). It is actually possible to read out a CCD when the shutter is open, by the way - the read out might just end up somewhat strange. Anyhow, the point I was making was that shutter speeds below the framerate are nonsense, because they defeat the purpose of shooting in a high framerate - I was merely reaction to this statement:
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Originally Posted by Thomas Smet
a shutter speed of 50 is the normal value of shutter speed regardless if you were shooting 12, 25, 50 or 100 fps.
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