[ATM] Mirror cell for an 8" mirror

["Corona Australis" <corona_australis@westnet.com.au>]

I'm making a 3 point mirror cell for an 8" mirror. I was wondering and
also hoping someone here could tell me what would be the preferable
distance from the mirrors centre to position the three points.

The mirror is an F/6, 204mm neat in diameter and is of a thickness of of 
23mm.

I was going to go with 60% from the centre seperated 120 degree. Does that
sound alright?

Thank in advance

Regards,

Ozzy 
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