Thread: Qhy9m to WO P-Flat 4 correct distance
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Old 27-11-2015, 06:47 PM
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Atmos (Colin)
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What calculation have you used for the QHY9 back focus distance? The QHY9 manual mentions 15mm, I have read of others using 17mm and then others saying that it is 16.2mm when taking the CCD chamber glass plate into the equation.
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