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Since my opening this post I found no place in NZ that aluminizes telescope mirrors but I have a son working in the glass/mirror business who is able to have silvering done on mirrors of practically any size at reasonable price (Ex Dunedin). The price given to me around $50 for a 22" mirror. Silvered surfaces come with 96-96% reflectivity as compared to 88-91% aluminium. The downside of the silvered surface is its shorter life but can last years if properly cared for.
Stephen
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