![]() ![]() Chances are good that you’ll see at least a few little specks, and if you’ve never cleaned your sensor before it may be pretty bad. Transfer the image to your computer and look at it full-size. Point the camera at the white surface and take a picture, moving the camera around just a little bit so that the background becomes blurry. Set your camera to manual mode, shutter speed of about two seconds, and the smallest aperture your lens will do. Find a brightly-lit white or light-colored wall, or a piece of plain white paper. There’s an easy way to test to see if you have noise on your sensor. These spots become highly-visible and quite annoying when the image is enlarged. On the right is a collection of full-size crops taken from the same image. You can’t really see it at the small size, but if you were to look at the full-resolution image you’d see lots and lots of little bitty spots all over the photo. It’s not a great photo, but because of the small aperture it shows every little piece of dust on the sensor. This flower was taken at f/32, which as we all know is a very tiny f-stop. They particularly stand out in areas that have large expanses of a single light color, but you can often see them in other areas of the image as well. You won’t see them too often at large apertures, but when you stop the camera down they start to become visible. These spots usually come from dust on your sensor. These often look like little dark spots ringed by a color that’s slightly lighter than the background, and they show up in the same place on every picture you take. Whatever the image, someday you’re going to look closely at a picture and see that it’s full of little spots. Maybe, as often happens with me, it’s the petals of a flower. You might notice it in the blue of the sky or the white of a wedding dress. ![]()
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