When exposures extend past 30 seconds into the realm of several minutes—or more—all digital cameras are theoretically susceptible to a phenomenon called amp noise, which manifests itself as a purplish glow, often around the edges of an image, creating an aurora borealis-style ghost effect. Amp noise happens when the sensor heats up during a long exposure, and some cameras fall victim more readily than others. The Rebel T2i resists this phenomenon better than most dSLRs, but you should be aware it exists, even if you'd need to use an outlandish exposure (on the order of 30 minutes or so) to create the effect with your camera.
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Are You Frustrated Because Your Graphics Are Not Looking Professional? Have You Been Slaving Over Your Projects, But Find Yourself Not Getting What You Want From Your Generic Graphic Software? Well, youre about to learn some of the secrets and tips to enhance your images, photos and other projects that you are trying to create and make look professional.