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November 6th, 2009, 12:36 AM
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#1 |
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Regular Crew
Join Date: Feb 2009
Location: sherman oaks
Posts: 26
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Jvc-gy-hd110 focus changes help me thanks !
i have JVC-HD110 camera WHY MY focus changes when i move the camera i mean when i zoom and focus and then i move the camera to something different .
the focus go out of focus any help thanks . |
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November 6th, 2009, 09:58 AM
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#2 |
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Inner Circle
Join Date: Jan 2003
Location: Chicago, IL
Posts: 6,609
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a pro type lens needs to be re-focused when moving from 1 subject to another that is nearer or farther away than the original subject that was focused on. obviously there is no auto focus (that's worth using) on a pro lense. however it COULD be the backfocus is out
__________________
What do I know? I'm just a video-O-grafer. Don Last edited by Don Bloom; November 6th, 2009 at 10:03 AM. Reason: changed respone |
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November 6th, 2009, 10:10 AM
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#3 |
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Regular Crew
Join Date: May 2009
Location: Schwabach (Germany - Bavaria)
Posts: 199
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You must set your backfocus to get
the correct flangeback, on the other side some user switch on the makrofunction of the lens. The result due to the focus is the same like a wrong flangeback. |
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November 6th, 2009, 03:02 PM
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#4 |
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Regular Crew
Join Date: Feb 2009
Location: sherman oaks
Posts: 26
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my back focus is ok i know when my back focus is out so it is not the back foucs ?
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November 7th, 2009, 12:49 AM
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#5 |
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Regular Crew
Join Date: Feb 2009
Location: sherman oaks
Posts: 26
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what do you mean by switch on the makrofunction ?
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November 8th, 2009, 03:02 AM
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#6 |
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Regular Crew
Join Date: May 2009
Location: Schwabach (Germany - Bavaria)
Posts: 199
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When you use for minimum object-distances
the macro on your lens (on Fujinon you must switch a little plastic switch - on Canon-lenses you push and change in the macroarea of the lens), sometimes that will be forgotten when its only 1 mm on the macro. Then it looks like a incorrect flangeback (backfocus). |
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November 17th, 2009, 01:22 AM
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#7 | |
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Contributor
Join Date: Jul 2005
Location: Sydney Australia
Posts: 873
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Quote:
If you are referring to zoom in and focus and zoom out,the object you originally focussed on should remain in focus IF the backfocus is set correctly. The only exception would be if you had your iris stopped down too far (anything much above F5 for 1/3" chips, F8 OK at a pinch) - nothing will ever focus correctly then. It may "appear" to be in focus when zoomed in but it is not -it just becomes more apparent on wider shots. |
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