GH2 Help--strange image 'ghosting'

E

Erick Stoll

Member
I've had a gh2 for about six months with the 14-140 stock lens. I've noticed, on occasion, a strange 'ghosting' effect, in which there appears a dimmer "double" of everything in the frame.

Any thoughts? Is there something wrong with the lens? Maybe image stabilization?

Here's a video of the effect:
 

Attachments

  • gh2blur2.jpg
    gh2blur2.jpg
    56.3 KB · Views: 0
  • gh2blur1.jpg
    gh2blur1.jpg
    47.7 KB · Views: 0
Last edited:
...So your GH2 was locked down solid while you were filming? ( no chance of the camera being less stable than it should have been )

If you can get this down to a repeatable event, then I would try the same thing with a different lens and see if the same problem persists with the 2nd lens.
 
Looks like acceptable motion blur to me. At 1/50th shutter speed, a leaf blowing in the wind, even a slight wind, will blur. Same with that stray piece of rope. When watching this in motion (as a video), it would look completely normal. As a still image, yes it's blurry. When shooting stills, higher shutter speeds are more common, in order to get less motion blur.
 
dvbrother said:
Looks like acceptable motion blur to me. At 1/50th shutter speed, a leaf blowing in the wind, even a slight wind, will blur. Same with that stray piece of rope. When watching this in motion (as a video), it would look completely normal. As a still image, yes it's blurry. When shooting stills, higher shutter speeds are more common, in order to get less motion blur.
Click to expand...

I've uploaded a clip of the leaves, this is definitely not motion blur:

 
Are you shooting with an ND filter on the lens? Or is there a UV filter on it?
I notice that it only really seems to "ghost" on the layers that are out of focus. The branch in the center in focus doesn't ehxibit the problem.
Do you recall what f-stop the lens is at when the problem arises?
 
dvbrother said:
Are you shooting with an ND filter on the lens? Or is there a UV filter on it?
I notice that it only really seems to "ghost" on the layers that are out of focus. The branch in the center in focus doesn't ehxibit the problem.
Do you recall what f-stop the lens is at when the problem arises?
Click to expand...

No, there is neither an ND filter or a UV filter; this is a naked lens. Yes, the more out of focus the more the doubling effect appears, but the 'in focus' layer looks strangely soft too--not out of focus, but... something else.

No, I can't recall unfortunately, though the two times I've definitely had this problem were very different lighting situations, so I'm assuming they were different f-stops. Still, I'll play around with this a bit more to see if I can recreate it.
 
One possibility is that there's actually something in the foreground between the lens and the leaf you are shooting. Another branch? I've shot footage where a close object is so out of focus that it's invisible to the lens, yet it still influences tha light hitting the lens. The result is a distortion of the image. An example would be to focus on infinity with a long lens and then put your fingers right in front of the lens. It sometimes creates a "ghosting" effect like shown in your video.

Or here's another possibility. If you are, indeed, shooting at 1/50th shutter speed without an ND filter, then you are probably stopped down to f11 or f16 to keep from overexposing. At those high f-stops, image resolution drops sharply. It's possible that shooting with the aperture stopped down that much is part of the issue. It's a guess.
 
Last edited:
You must log in or register to reply here.
Back
Top