http://arxiv.org/abs/2201.12466
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-Chr\’etien-Coud\’e (RCC). Our tests show that Fm is immune to the problems inherent in the popular half-flux diameter method.
C. Tan and B. Schulz
Tue, 1 Feb 22
64/73
Comments: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society (MNRAS) Published by Oxford University Press on behalf of the Royal Astronomical Society
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