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Kameratechnik: Optik: Center Shift

Camera Technology: Optics: Center Shift



Frage von ron83:
Juni 2009

Hello,

has anyone here ever what the "center shift" belongs to? It is the shift of the optical axis of changing zoom and focus.

How does this Phönomen from the Picture? Is it synonymous distortion? What can you do?

IMHO yes it is missing a piece of picture, because it does not work correctly on the CCD is displayed?

Unfortunately, Google knows about not very much and I hope here on practical experience. I'm in the issue not so at home ...


Thanks & VG



Antwort von Valentino:

I can you explain the concept, but I get this problem of major film optics know, but for video it should give something synonymous.

The center shift is the name of how far the center of the optics to the (On) zoom moves.

As a small example, you take a video camera and mankierst the middle of the screen (to protect something previously Tesa drüber) with a dot or cross. For larger cameras, you can have such a cross is synonymous via the menu.
Now you set the Camera (s.besten on a tripod) against a wall and mark wall s.der a punk, you then with the center on your screen do the same.
It is important that the camera is always parallel to the wall.
If you now zoom to the point you will discover, that this is not exactly in the middle and is exactly what is the center shift.

The whole is simpler if you have a camera with optics Exchangable searched, because the you can see the Optics in front of a (slide) projector is stretch and a test image on a wall projection.
If you now at the center of the wall of the test mark image slides, you will find you to zoom to this from the middle left or right moves. Too much should not these two points apart, but the most expensive synonymous Kine-Zoom or Digizoom economy is not exactly keep his focus.

Now the focus is the same effect to occur, only that this is not as strong as when zooming.
Here you can just shoot at the old sharpness and large shifts of this "pump" very clearly observed, because the image is larger or smaller.
In optics, this new "pump" but as good as been removed.




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