Question about Nikon D70s Digital Camera

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There is some black unremovable dots (not visible on sensor sirface). Is IMAGE DUST OFF REFERENCE DATA helpful to remove that black dust like dot from image? how can I use that feture?

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Black, unremovable dots are probably bad pixels in the sensor. These are parts of the sensor that no longer react to light. If you don't see any issue looking through the viewfinder, then the sensor is messed up. Since you say you don't see anything on the surface, I assume the optical part of the camera is in tact. You can try cleaning the sensor - Menu - Setup - Clean Image Sensor - it certainly can't hurt.

Posted on Nov 06, 2010

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Posted on Jan 02, 2017

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If the dot is not visible in print, but only on the camera's screen, the its only the LCD that is faulty.

If the dot is visible on screens and in print, then yes, it could be the sensor. Try taking pictures without the digital zoom. Chances are the dot is only visible with the digital zoom because the picture is interpolated.

If all else fails, you can try cloning out the spot in an image editor on the computer.

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