A sensor brush for easy cleaning
I do my own wet cleaning, on my Z6 and now on my Z6 iii. I now use a "sensor brush" for a simple dust removal. It's fast and easy. The brush doesn't always remove every spot. If there's noticeable stubborn dust spots, then I do a wet cleaning.
Dust blobs show up in areas of smooth color and at smaller apertures. Wide open, they often aren't noticeable in a typical scene. So I don't worry about a few faint blobs, waiting to clean until it gets more obvious.
The photo test will show an astonishing number of very tiny dust spots. But scenes at f/16 with large, flat color areas aren't a typical photo subject, and the spots become invisible at smaller apertures or a more detailed scene. Clear blue skies are the most common way for me to see dust spots.
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Two easy steps:
1. Testing for dust:
I can't see the tiny dust particles on the sensor at all. Big ones usually get removed by the rocket blower. Some cleaning guides mention using a camera sensor loupe to examine the sensor surface with a lot of magnification -- I don't do that.
I take a test shot:
Launch Notepad in Windows, full screen. It's just a white background for the test shot.
Use Manual mode. Use the smallest lens aperture, f/16 or smaller.
I want a slow shutter speed to blur the scene. Then only the dust blobs show up. Use something like 1/4 or 1/2 second and Auto ISO. The photo will look gray with this auto ISO exposure. You might want a +1 Exposure Comp to brighten it.
Focus at infinity, fill the frame with the white screen, and move the camera in a small circle while you shoot a few shots. Now the screen is completely blurred, and only the dust blobs are visible, since they don't move on the sensor itself.
I used to import the test shots into my editor and crank up the contrast -- yikes! that shows tiny dust blobs everywhere! Now, I mostly just do in-camera image review, zooming in partway and panning across the full image.
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2. Sensor brush cleaning:
This is quick and easy, so I do it more often than I used to do wet cleaning.
I got a sensor brush that was stocked at the local camera store.
Blow off the sensor with the rocket blower to remove any really large dust pieces. Smaller ones seem to be stuck onto the sensor by static electricity or a similar effect, and the air flow doesn't remove them. I've never had the in-camera dust vibrating fix any dust.
Blast the bristles with the rocket blower, to build up a small static charge and to to clean the bristles. This brush comes in a capped storage tube, to help stay clean.
Brush once left to right, then flip the brush over and go right to left, to include the edges of the sensor. It's a very light pressure, just enough to get the tips of the brush on the sensor. No residue, and no worry about missing part of the sensor. Very non-technical!
I like to blast the bristles again, and repeat one more time.
Shoot another test shot. There's likely a few spots still on the sensor. Remember that the sensor is a mirror image of the dust locations: A top left dust spot in the photo will be bottom right on the sensor.
Decide when it's "good enough". That's usually two passes for me.