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Originally Posted by robagar
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mass produced mirrors are all good
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I would not go that far. There are some real shockers out there. I have a Meade LXD75 6" Newt and the mirror is a complete lemon.
btw. I just remembered that Saxon 10 and 12" Dobs have pyrex mirrors, which is why they are more expensive, but for visual astronomy you certainly don't need pyrex up in Rockhampton.