Getting Started: Long Exposure Astrophotography by Hall Allan
Author:Hall, Allan [Hall, Allan]
Language: eng
Format: epub
Published: 2013-04-15T21:00:00+00:00
Why this concerns us is that dynamic range is reduced as ISO is increased which causes a problem with exposures. When you increase ISO, sensor gain noise is increased, but as you increase exposure time, thermal noise increases. Danged if you do, danged if you don’t. But then there is dynamic range to consider. This leaves you with the best option. Use the longest exposures you possibly can with a low ISO to increase your dynamic range, and ignore thermal noise which will be largely filtered out with darks.
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