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A Fourier method for the determination of focus for telescopes with stars

We introduce a Fourier method (Fm) for the determination of best focus for telescopes with stars. Our method fits a power function, that we will derive in this paper, to a set of images taken as a function of focuser position. The best focus position is where the power is maximum. Fm was first tested with small refractor and Schmidt-Cassegrain (SCT) telescopes. After the successful small telescope tests, we then tested Fm with a 2 m Ritchey-Chrétien-Coudé (RCC). Our tests show that Fm is immune to the problems inherent in the popular half-flux diameter method.

preprint2022arXivOpen access
C. Y. TanB. Schulz
astro-ph.IM
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Open access2 authors1 topic
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C. Y. TanB. Schulz

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