Falcon de-rotation - what factors influence accuracy

Questions and feedback about the rotator itself, adapters, de-rotation etc
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AstroPete
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Falcon de-rotation - what factors influence accuracy

Post by AstroPete »

Just a quick question - what are the factors that influence the rotation step 'accuracy' in order to properly rotate the field with out errors at edge of field for longer exposure astrophotography? Is it scope focal length, sensor size i.e. distance to edge of sensor? Something else? And is there a calculation to determine if it is suitable for a particular scope+camera combination

Many thanks

Pete
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Evans
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Re: Falcon de-rotation - what factors influence accuracy

Post by Evans »

Focal length is the major factor. Also position of the target in the sky. Each azimuth/altitude position has a different rate of rotation.
AstroPete
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Joined: Thu Feb 17, 2022 12:33 pm

Re: Falcon de-rotation - what factors influence accuracy

Post by AstroPete »

Do you have any more examples of images with different telescope and camera combinations than the two that you post on the Falcon web page?

Position in the sky aside, I assume that a shorter focal length resulting a wider field of view and a larger sensor size will result in more angular rotation and trailing for stars on the edge of field and therefor smaller rotation stepsizes to correct but my logic could be well off.

Many thanks

Pete
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