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August 23rd, 2009, 08:15 PM
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#1 |
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Regular Crew
Join Date: Jun 2007
Location: North Port, FL
Posts: 96
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DOF round black thing
Okay I'm using a DOF on one of my cameras and I have a black circle on top of my footage that appears and disappears. The more you zoom in on the camera the less its visible but its hard to get that focus point. My qustion is why does it appear like that? could it be because of the lens? See photo attached.
Thanks. Let me know how to solve this problems... thanks! |
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August 23rd, 2009, 10:36 PM
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#2 |
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Inner Circle
Join Date: Dec 2003
Location: PERTH. W.A. AUSTRALIA.
Posts: 4,476
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It looks like you are not zoomed in far enough and are picking up the spindle hub of a disk adaptor.
If you look at the corners of the image, you will also observe brightness falloff, another sign you are zoomed too wide. |
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August 24th, 2009, 08:48 AM
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#3 |
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Major Player
Join Date: Mar 2008
Location: Sherman Oaks, CA
Posts: 325
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If your DOF adapter has an X/Y adjustment, this could also be out of alignment. Having proper X/Y means you don't have to zoom in as much to compensate for it being out of alignment and would possibly make focusing a bit easier, as well.
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_______________________________________________________________________ Canon XHA1 * SGBlade 35mm adapter -RR1, RR2 w/ Optics Upgrade * DIY Mid-Format adapter |
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August 24th, 2009, 06:12 PM
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#4 |
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Regular Crew
Join Date: Jun 2007
Location: North Port, FL
Posts: 96
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Okay thanks guys!
Its just if I zoom in a little more it could get out of focus... I guess theres a fine line between the out of focus point and the black spindle! I'll see if I have the alignment on my camera, otherwise I'm just going to have to get used to it. Also its weird but when I pan up or down the circle sometimes gets bigger... I used the REDROCK micro... is that normal? Anyone have this system? |
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August 30th, 2009, 10:41 AM
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#5 |
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Trustee
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The spindle is dipping in and out of your frame because you have image stabilization on. When you pan up or down the lens compensates and the spindle dips into your frame. Turn image stabilization off and see if the spindle circle stays put.
Marcel is on the money...adjust the X/Y position of the adapter on the lens to center on a point further away from the spindle.
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BenWinter.com |
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September 3rd, 2009, 12:59 PM
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#6 |
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New Boot
Join Date: Jun 2009
Location: Finland
Posts: 5
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Ups, nothing...
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