Supersonic_Blimp wrote:for those dust spots...
Dust spots on the sensor appear as out of focus blobs on digital photos. They are a common problem especially on cameras with interchangeable lenses. When you change lenses dust can easily enter the sensor area. The spots are most noticeable in places on the photo that are of a uniform texture and color. Like the sky.
Small specks on lenses will usually not appear on photos. Still it is a good idea to keep lenses clean and free of dust as that dust will degrade overall image quality. Always keep a lens cap on the front of the lenses when not shooting. Keep both front and rear caps on lenses that are not on the camera.
Dust specks on the mirror of a single lens reflex camera will appear in the view finder but they will not appear on the photo because the mirror moves up and out of the way when the shutter button in pressed.
Sensor cleaning is a difficult task that requires great care. The most I do with my cameras is to use a rocket blower to blow the dust off the sensor. This is a small rubber bulb with a nozzle. Squeeze the bulb and a blast of air can be directed toward the sensor. Do not use canner air for this as the propellant in canned air can get on the sensor and cause more problems. Most dust specks can be removed with a rocket blower. Changing lenses in the rain or snow can result in more serious specks that are more difficult to remove.
BTW: Some camera manufacturers include dust spect removal in there software. My canon camera (5D MKII) has this. It combines a blank image image captured by the camera sing the dust speck removal function of the camera with the processing software provided by Canon called Digital Photo Professional. Check the camera manual carefully to learn how to do this.
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