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April 5th, 2006, 09:48 AM
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#1 |
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Regular Crew
Join Date: Oct 2005
Location: Herning, Denmark
Posts: 45
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Blurred motion
Hi!
I have just finished a documentary and found a strange behaivoir in some of the pictures. I have shot the documentary in SD 16:9 PAL with the wideangle lens - and e.g. in the interviewposition I find something that looks like a kind of motion blur when the interviewperson moves her head quickly - the hair and the skin-colour seems to blur and having problems in updating the colours. Has anyone experienced that?? And knows why this is happening. Is it a setup problem or.... |
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April 5th, 2006, 11:20 AM
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#2 |
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New Boot
Join Date: Nov 2005
Posts: 9
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blur
I have the same problem! Some time ago I asked this forum about the blurring images, and somebody called them ghostframes. I really don't now what it is. Sometimes I think it's the bad quality of the lens. But when I film with aperture 8 or even 11 I've still this problem!
Maybe it's gone using the expensive wideangle lens. Next week I'm gonna try it. Can you show us some footage or frames? |
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April 5th, 2006, 12:21 PM
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#3 | |
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Major Player
Join Date: Jul 2004
Location: Phoenix, AZ - USA
Posts: 300
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You specifically mention skin tones - are you using the skin tone detail feature? Maybe it doesn't handle motion well. Are you using the motion smoothing feature? I haven't heard many good things about it. I've never seen this problem myself. |
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April 5th, 2006, 12:28 PM
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#4 |
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Trustee
Join Date: Sep 2005
Location: Gilbert, AZ
Posts: 1,896
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Were you shooting 24P at 48 shutter, or 24 shutter?
A 24 shutter will give you blurred motion. This is the nature of exposure time vs movement with ANY camera Hans, I'm not sure where an f-stop of F8 has to do with motion blur. I can suggest to never use any stop less the F8. Diffraction will be an issue stopped down less that F8. All lens on ANY camera have a sweet spot. Some are better than others. This is the nature of lens. |
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April 5th, 2006, 12:37 PM
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#5 | |
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Regular Crew
Join Date: Oct 2005
Location: Herning, Denmark
Posts: 45
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April 5th, 2006, 12:38 PM
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#6 | |
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Regular Crew
Join Date: Oct 2005
Location: Herning, Denmark
Posts: 45
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I used the wideangle lens
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April 5th, 2006, 12:47 PM
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#7 | |
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Regular Crew
Join Date: Oct 2005
Location: Herning, Denmark
Posts: 45
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No...
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The skin detect is off and the motion smothing is not an option in SD mode |
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April 5th, 2006, 12:52 PM
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#8 |
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New Boot
Join Date: Aug 2005
Posts: 21
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I had the same trouble a while ago shooting with my z1.
After many testing,(i was trying to over and under crank) i finally find out that the ghost frames are strictly related to the shutter speed. Do not confuse the shutter speed with the frame rate. 25p it means you're shooting at 25 frames per second and have nothing to see with the speed of the shutter. Hope it helps |
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April 5th, 2006, 01:48 PM
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#9 | |
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Regular Crew
Join Date: Oct 2005
Location: Herning, Denmark
Posts: 45
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April 5th, 2006, 01:57 PM
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#10 |
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Wrangler
Join Date: Oct 2002
Location: Los Angeles, CA
Posts: 2,100
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Shooting DV mode 25P with shutter off means the effective shutter speed is 1/25th.
Turn the shutter on and set to 1/50th.
__________________
My Work: nateweaver.net |
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April 5th, 2006, 02:26 PM
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#11 | |
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Trustee
Join Date: Sep 2005
Location: Gilbert, AZ
Posts: 1,896
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No wonder. I guess I missed the shutter off in his post. As Nate mentioned, with the shutter off the exposure time is based off of your frame rate. This explains why you're getting motion blur. This is normal |
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April 5th, 2006, 02:36 PM
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#12 | |
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Regular Crew
Join Date: Oct 2005
Location: Herning, Denmark
Posts: 45
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April 5th, 2006, 04:37 PM
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#13 | |
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Wrangler
Join Date: Aug 2005
Location: Toronto, ON, Canada
Posts: 3,637
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In DV25P mode on the "E" model, the default shutter OFF is 1/25th. It of course should be 1/50th. The same goes for DV24P and 1/24th on the "U" model. It should be 1/48th. At least they got it right in the HD modes!
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Tim Dashwood |
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April 6th, 2006, 12:38 AM
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#14 | |
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Regular Crew
Join Date: Oct 2005
Location: Herning, Denmark
Posts: 45
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Just to get this right. You are saying that in HD mode - if you have the shutter turned off - it will work OK in this mode?? Is the default in HD 1/50th when turned off... |
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April 6th, 2006, 06:34 AM
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#15 | |
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Inner Circle
Join Date: Feb 2006
Location: Belfast, UK
Posts: 6,143
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You can switch the shutter OFF if you need the extra exposure, however, you will get increased blurring on any motion. Because the JVC is progressive when shooting HDV the default will be a shutter speed of 1/50th when shooting 25p. |
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