Stargazing Primary mirror for dobsonian telescope

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A concave aluminum mirror can be used as the objective mirror for a Dobsonian telescope, but it presents challenges due to its high thermal expansion, which affects accuracy at varying temperatures. Polishing the mirror is complicated, as heat generated during the process alters its shape unless a diamond turning machine is used. Additionally, the aluminum surface will oxidize, necessitating either aluminization or the removal of a thin oxidized layer. These factors must be considered to ensure optimal performance of the telescope. Proper handling and treatment of the aluminum mirror are crucial for effective use.
josue2503
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can i use a concave aluminum mirror as an objective mirror of a dobsonian telescope??
 
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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
 

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