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I am considering a 19.5in F5 project with
edge thickness
40mm. Plop tells me that a 9 point support is
sufficient, but this doesn't sound
right. ( I though a minimum of 18 points would be
required.). Can anyone
shine some light on my doubt?
Also I was told the mirror is made of Suprax and
weighs only 12Kg.
Has anyone heard of Suprax?
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