AlejandroGomez Posted April 27, 2017 Share Posted April 27, 2017 Hi guys, I was just cleaning the sensor of the A7SII when I saw that a lower aperture you can see all the dirt on the sensor, but if you go up to f1.8 you stop seeing them. Maybe the question is stupid but I'm figuring out why this happens, theres some technical explanation ? Quote Link to comment Share on other sites More sharing options...
Mark Dunn Posted April 27, 2017 Share Posted April 27, 2017 (edited) Because the dust is actually on the anti-aliasing filter in front of the sensor, it casts a shadow on the sensor. At large apertures the shadow is spread over a large area. A small aperture casts a smaller, darker shadow. https://photographylife.com/why-sensor-dust-is-more-visible-at-small-apertures/ Edited April 27, 2017 by Mark Dunn 1 Quote Link to comment Share on other sites More sharing options...
AlejandroGomez Posted April 27, 2017 Author Share Posted April 27, 2017 Hi Mark, Thank you very much for the explanation and the link! Quote Link to comment Share on other sites More sharing options...
Daniel Meier Posted May 8, 2017 Share Posted May 8, 2017 I used to think that this has to do with the larger depth of field you get with an f/16 compared to say a f/1.8. Is that true to some degree? Quote Link to comment Share on other sites More sharing options...
Mark Dunn Posted May 8, 2017 Share Posted May 8, 2017 In short, no. DoF applies to what's in front of the lens. Quote Link to comment Share on other sites More sharing options...
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