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    • You'd think so, but no!  If you're using like an f/1.2 lens, you can have surprisingly big dust spots on your sensor and never be any the wiser.  The more stopped down, the more they appear.  From what I remember, and I might be wrong about this, it's bascally the same effect as using a large diffuse light source vs a small point source - put your hand next to a white card near the large diffuse source and you'll get a blurry, indistinct shadow.  Do the same with a small point source and you'll get a well-defined crisp shadow.  It's the same on a smaller scale with sensor dust.
    • I did think of that, but took it out of my reply because I was thinking that anything on the sensor would be in-focus regardless of what the lens was doing.  Maybe I'm wrong though, not sure..
    • That, and also to set the aperture down to like f/16 or f/22 and shoot something - or even to put a pinhole lens on and shoot something.  If you ever want to know how many pieces of dust have landed on your sensor, a pinhole lens is the quickest way to see them all.  🙂
    • First thing I'd do is fit a mild-telephoto lens, focus it wrong so it's all blurry and point the lens at something that is one colour - like the sky or a blank wall - and see if the mark appears on the footage.  If it does then you have a problem, otherwise it won't show and you're fine.  It may show up in the bokeh of out-of-focus areas too, but texture or patterns in bokeh is normally relatively benign and very common.
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