Quote:
Originally Posted by rainwatcher
I am considering making a 16" but the price of mirror blanks for me is prohibitive. I note that some people say 19mm float glass is cheaper and available. Where ? I have done the usual google search and can only find big plates. Also how does one make it round to start off with ?.
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Yes any glass shop who does table tops should be able to supply 19mm.
However I just wouldn't recommend it. If you had the skills to make such a thin mirror you would be wanting to do something thicker anyway - I have a lot of experience and i wouldn't bother doing something that thin. The chances of making something that would work well at high power would be extremely slim. I think Sydney Glass may have some 25mm plate but it won't come cheaply.
I wouldn't recommend anything thinner than 1.5" for an amateur of medium skill level ( assuming has made some successful larger stuff like 12" )