Quote:
Originally Posted by redsquash
I have the holes but not the grub screws. 
This is a new scope. |
Take another look. These are grub screws with a hex socket in them which are buried into the hole drilled and tapped in the cast aluminium. Similar deal to the 3 secondary mirror adjusting screws.
Quote:
My other question was,
what happens if the primary mirror isn't centred properly.
Ie if it is 0.1mm or 0.2mm or 0.3mm or 0.4 mm off
Is this error acceptable.
or put another way
What margin or error is there available when marking the primary?
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Do the best you can. I doubt anyone can guarantee better than 0.5mm accuracy and even 1mm out isn't the end of the world.