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After some testing, I determined that there was some dirt on my 18-50mm lens.

Here is the photo of a white wall with my 18-55mm:

enter image description here

You can see the settings of above photo here:

enter image description here

Here is the same wall with a 27mm lens:

enter image description here

It is 'spotless'.

So I determined that the dirt must rest on the rear end of the 18-55mm lens.

However after cleaning my lens, the situation got worse. Not only did one of the spot remain, it became more prominent; there is also a string of fiber adhered to the surface.

enter image description here

I used the following to clean my lens.

enter image description here

How can I recover from this?

  • When you tested the shots, did you stop down to f/22? – OnBreak. Dec 22 '19 at 5:23
  • Yes for the 18-55mm. Attached the photo metadata to the question. – Anthony Kong Dec 22 '19 at 5:24
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    But not the 27? It looks like sensor dust to me...and wide apertures blur the dust and make it harder to see...so you’d have to test again with the 27 but at f/22 to confirm. Dust on a lens...scratches even...can be pretty bad before it starts to impact image quality. I’m betting you just have some dust on the sensor. – OnBreak. Dec 22 '19 at 5:27
  • The 27mm does not have an aperture ring like the 18-50mm, so I am not sure how to set it. – Anthony Kong Dec 22 '19 at 5:38
  • @AnthonyKong You should be able to set aperture on lenses without aperture ring by scrolling the thumb wheel. – xiota Dec 22 '19 at 8:53
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What you are seeing is the result of dust on your sensor, not on the lens.

Most modern Digital SLR and mirrorless cameras have a sensor self cleaning mode. Check your manual for instructions on how to use the self cleaning system, or how to manually clean the sensor yourself using a blower or other methods.

You can also have a camera shop clean your sensor.

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