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?

Hi Emmanuel,

I think your projector lamp and LCD area is dusty.
please use pressurized air can and clean the area.also check the dust filter.
do it carefully.
regards,
nuwan

Sounds like there is dust on your CMOS (the image sensor) or the lens. You need to have both cleaned and things should probably be back to normal.

Thomas Drayton
Owner, www Darntoothysam com Digital Camera Repair

If you focus the image on a screen up close to the projector and notice small rectangular black and white spots, then you have pixel failures.

Does the dot appear on the pictures? If so, this is a dust particle on the sensor. If not, then it is a particle on the focussing screen and really presents no problem.

Common problem, easy solution. It is dust on the chip.
At first try to blow the spot away on the image chip. Don't use your mouth or air, but use the airblaster.
And there are special swap stick which can help. Go to a photodealer, they will have the swaps. If you don't trust yourself, it's on the image chip, let the shop do it.

This sounds like dust on the sensor. You'll need to clean it. Google the words "cleaning a DSLR sensor" and you will find sites explaining the procedure with pictures and info about where you can get the supplies.

Your sensor has some dust stuck to the sensor. You will have to take it to a service center, they will clean up the sensor for you. It is inexpensive.

This is dust on the sensor. Google the words...cleaning a digital camera sensor. You'll find instructions and sources for supplies.

Please...do not touch the mirror!!! The black dot is dust on the sensor. Google the words...digital camera sensor cleaning. You will get complete directions and where to buy the supplies.

Hi,

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.