Answers for Hi - I bought the 160mm diameter mirror and there is a small white dot in the center (approx 3mm across)

Cassini Spherical Primary Mirror

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Answered by Don, guest, from OR, United States, on March 25, 2019

This dot is placed by the manufacturer to assist in collimation.

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Answered by michael, guest, from CA, United States, on April 04, 2019

Leave the dot! It aids in collimation and does NOT affect viewing!

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