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Question on Bahtinov masks and HFR

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I have a question - if a Bahtinov mask is in place are the HFR readings (taken with mask on) meaningful? I have seen tools that show both the deviation of central spike and the HFR and in my simple brain I thought that due to the diffraction spikes we would not be able to accurately measure the HFR.

Edited by AstroMuni
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