Primary mirror for dobsonian telescope

josue2503 · Jan 31, 2008

can i use a concave aluminum mirror as an objective mirror of a dobsonian telescope??

mgb_phys · Jan 31, 2008

Yes - but
It has a high thermal expansion so it will only be correct at one temperature, this also makes it difficult to polish since the heat from the polishing changes the shape while you are polishing it - unless you have access to a diamond turning machine.
You will still have to either aluminise it or find a way of removing a thin top layer of the aluminium as it oxidises

Primary mirror for dobsonian telescope

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Primary mirror for dobsonian telescope

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