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Mastering the Olympus OM-D E-M1 by Darrell Young

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Noise Reduct.

During a long exposure the sensor may exhibit more noise than is acceptable. The sensor gets warm after several seconds of use. This warming effect produces amp noise, which causes warmer sections of the sensor to have more noise than cooler sections.

This noise resembles a fog-like brightening around the edges of the frame. Also, there can be bright spots with various colors at numerous places in the image. This special type of long-exposure noise degrades the image in a different way than the noise from high-ISO sensitivity, which presents as grainy ugliness in darker areas of the image.

Using Noise Reduct.

When you enable Noise Reduct. (long-exposure noise reduction) and an exposure is longer than about 2.5 seconds, the camera ...

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