For primary mirrors of Newtonians without center marking, the center must be determined "visually"

For primary mirrors of Newtonians without center marking, the center must be determined "visually"


For Newtonian primary mirrors without a center mark, the center must be determined visually. For this purpose, we usually use the mirror's three mounting brackets. These brackets allow for a good estimate of the center.

For a more precise measurement, the primary mirror must be removed and the center determined by measurement. It is then sufficient to mark it with a permanent marker.

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For primary mirrors of Newtonians without center marking, the center must be determined visually