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<blockquote data-quote="Calgary 617" data-source="post: 21733" data-attributes="member: 6349">It's pretty easy to see all dust spots and what kind they are.Set you camera to aperture priority mode, metering to matrix, set the ISO to the lowest possible setting (not LO, either 100 or 200, whatever the D7k can do), turn off auto ISO if you have it on. Turn off the AF and set it to manual, set your aperture at the highest value possible for the lens. Either shoot clear blue sky or a white piece of paper (it needs to cover the full viewfinder/sensor) with the lens out of focus.Then you will a) be able to see the spots by zooming all the way in on the back screen of the camera and move the zoom all the way over the picture. You will be amazed how much there is on besides those two you already see in your shot. And b) you will be able to determine if you actually have some sort of fluid that dried on the sensor or simple dust.If it's just dust, you can try blowing it off the sensor, but DO NOT use any compressed air spray which can easily blow more moisture on the sensor (condensation). If it is actually dried liquid, a sensor cleaning will get rid of it. You can either go to a place that can do it for you or do it yourself.</blockquote>

[QUOTE="Calgary 617, post: 21733, member: 6349"] It's pretty easy to see all dust spots and what kind they are. Set you camera to aperture priority mode, metering to matrix, set the ISO to the lowest possible setting (not LO, either 100 or 200, whatever the D7k can do), turn off auto ISO if you have it on. Turn off the AF and set it to manual, set your aperture at the highest value possible for the lens. Either shoot clear blue sky or a white piece of paper (it needs to cover the full viewfinder/sensor) with the lens out of focus. Then you will a) be able to see the spots by zooming all the way in on the back screen of the camera and move the zoom all the way over the picture. You will be amazed how much there is on besides those two you already see in your shot. And b) you will be able to determine if you actually have some sort of fluid that dried on the sensor or simple dust. If it's just dust, you can try blowing it off the sensor, but DO NOT use any compressed air spray which can easily blow more moisture on the sensor (condensation). If it is actually dried liquid, a sensor cleaning will get rid of it. You can either go to a place that can do it for you or do it yourself. [/QUOTE]

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