How Clean a Sensor is Reasonable?

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CameraCarl Veteran Member • Posts: 6,770
How Clean a Sensor is Reasonable?
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I just had the sensor on my Canon 5D Mark IV "professionally" cleaned. When I take a photo of a clear blue sky at f/22, I can see eight small donut shaped spots on the image. At f/18 I can see four of them and at f/16 only one.  I was expecting to get a clean sensor back from the shop.

I'd like to ask the community: how clean is reasonable? Is it reasonable to expect the sensor to be spot free at f/22 after a cleaning? How many dust spots do you tolerate?

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