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Just thought that I would add my 2 cents worth. Making mirrors is not an easy task and starting out with such a big mirror for a first attempt will probably end in dissapointment. most people usually start with a 6 or 8 inch mirror then proceed to larger sizes. I started with a 10 inch and have made 7 mirrors none larger than a ten inch. just now I'm contemplating making a 16 inch (if I can find a blank), and for making a cassegrain that is another story in itself. I wouldn't go there unless you were really keen (trust me I'm battling with one now). I'm not trying to sound negative about it but starting smaller is the only way to go. Just my opinion.
Regards cristian
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