Meteorology - Optics - Precision
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Off-axis guides

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Off-axis guides

The Off-axis Guide is an essential accessory for astrophotography with long focal length telescopes that need to have the most accurate guidance system possible.

Off-axis guidance uses a prism that intercepts a small portion of the telescope's focal plane (outside the field of view of the imaging camera) to locate a guide star. Once this star is located, tracking will become more effective.

The guidance in astrophotography is basic, a small deviation or abrupt movement, will alter the captured image, therefore the greatest possible precision is needed. In this sense, the off-axis guides are a very useful accessory

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