How to Clean a Nikon D750 Image Sensor

Power on the camera by moving the switch to the "On" position.

Turn the dial on the left side of the camera to the letter A. This sets the camera mode to “shutter priority.”

Make the aperture (the hole in the lens) small by turning the wave wheel to the right. The wave wheel is located in front of the camera and beneath the “Off/On” button. Turn the wheel until it reaches “F16” on the screen.

Confirm the Location of the Stain: Press the shutter against a plain white surface and take a picture. If the camera sensor has dust or debris covering it, then there will be darker spots on the image.

Lower the reflector mirror of the camera.

Go to the “Set-up Menu” and select the “Cleaning” option.

Select “Lock Mirror Up for Cleaning.”

Select “Clean Image Sensor” for automatic cleaning.

Move the power switch to the "Off" position to turn the camera off.

Press and hold the button on the right side of the lens, and while doing so, gently twist the lens to the right in order to remove the lens.

Locate the white dot on the lens and on the right side of the camera. Rotate the lens until the both dots line up to each other.

Prepare a pair of safety gloves to continue the cleaning process.

Cleaning for small amounts of dry ash particles: Use the “automatic cleaning” function 5-10 times to achieve removal

Use manual cleaning for the other stains that were not removed during the automatic cleaning process.

Use the “air blow” tool to remove particles from the camera sensor. Do not allow the nozzle to enter too deep inside the camera. This is to avoid any damage.

For tougher stains on the sensor, blow air on the stain to remove any particles. Then, clean the stains with an alcohol wipe.

The “air blow” tool can also be used to clean the lens. The third photo depicts a clean lens.

When the cleaning is finished, reinstall the lens. Angle the lens so that the white dots align. Turn the lens to the left until the white dot on the lens reaches to the top.