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March 11th, 2007, 08:52 PM
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#1 |
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Regular Crew
Join Date: Feb 2007
Location: Gilbert Arizona
Posts: 96
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Frame rate vs. shutter speed
It seems like the only frame rate or shutter speed that will not strobe is 60i, is that correct or am I missing something. Why is it the shutter speed indicated as TV mode on the dial. Getting happier with my two new twins...Gary
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March 11th, 2007, 09:42 PM
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#2 |
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Obstreperous Rex
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Tv = Time value. Shutter speed is a function of time.
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March 11th, 2007, 09:46 PM
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#3 |
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Regular Crew
Join Date: Feb 2007
Location: Gilbert Arizona
Posts: 96
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And I thought TV means TV, how 50's am I, any way to have smoother pans in anything other than 60i. Gary
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March 12th, 2007, 03:30 AM
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#4 |
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Major Player
Join Date: Nov 2006
Location: Baltimore, Maryland
Posts: 234
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Strobing is just the nature of 24p and 30p. Video 24p is a simulation of film...and the strobing is a side-effect of the simulation. That and the smaller imager size compared to 35mm film (35 has less depth of field and therefore strobing isn't as apparent) makes the problem worse.
I wish people who make documentaries weren't obsessed with the frame rate because any handheld shots done in 24p (and most indy documentaries have a decent amount) make me dizzy. Details get lost in the blur...no good IMO. Gunner Palace and Supersize Me (video to film to DVD transfer) come to mind. To each their own though. Content is what really matters and both of these docs entertained (sorry to go off on a tangent). Shooting 30p (or 30f, in Canon's case) should yield smoother results. However...you can't easily (read: without making it look ugly) transfer 30p to the PAL format. But if you're certain you will only be distributing your project on NTSC...you're gold. I vaguely remember seeing a post about shooting 24p at 1/80 shutter. This may have been for a different camera...but it's worth a shot...I guess. A good discussion about the video strobing issue can be found here: http://www.dvinfo.net/conf/showthread.php?t=72722 |
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March 12th, 2007, 08:35 AM
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#5 | |
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Regular Crew
Join Date: Feb 2006
Location: Tokyo, Japan
Posts: 157
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Quote:
There are a few tricks though to make it more seemless. One being panning on action, like an actor walking, pan at same speed and first watch no one will notice. Whip pans, whip pan and zoom. Shutter is more an artistic choice than anything. Though below 1/48th youre getting a videoish look. |
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March 12th, 2007, 10:11 AM
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#6 |
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Major Player
Join Date: Dec 2006
Location: Birmingham Alabama
Posts: 259
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It seems that looking on the LCD the strobing is more exaggerated than what is actually recorded to tape... During playback it seems to look much smoother..
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March 12th, 2007, 10:16 AM
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#7 |
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Regular Crew
Join Date: Feb 2007
Location: Gilbert Arizona
Posts: 96
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Thanks for the imput, My main concern is being one of those "wedding guys", (don't let that out), during reception fast dance scenes, I'm trying to get the best low light performance, 30 vs 60, but can't put up with the strobing, especially with the "chicken dance"!!! Thanks again, Gary
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March 12th, 2007, 12:42 PM
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#8 |
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Wrangler
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The other way that 24P appears to have a smoothness is during projection, each frame is flashed twice and our persistence of vision fills in the missing part. The darker the viewing area, the longer our persistence of vision because of our dilated pupils. That's why theaters are darkened. Not just to make the image bright, but to help our persistence of vision work at such a low frame rate.
-gb- |
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