Dust and smudges on Sony A7R3 sensor

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Nishi Sharma Contributing Member • Posts: 737
Dust and smudges on Sony A7R3 sensor

I have been very careful while changing lenses. But yesterday I noticed some smudges and dust spots on the sensor. Here is the picture I took of my clean computer screen with white created in PS on it:

Before cleaning the sensor shot at f22

I then used the jumbo blower which is always in its box to prevent it from collecting dust. Also used the Cleaning Mode in Setup 2 several times and that seems to have done a very acceptable job.

After using the Cleaning Mode

I can understand dust on the sensor but am puzzled about the smudges if that is the right word for them. Initially, I thought they were oil marks that could only have gone with wet cleaning.  Any thoughts?

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