12.5 cm homemade reflector
I made the second comet-seeker at age 15.
This mirror is apparently undercorrection. I did so on purpose,
because I was not confident my measurement and I red somewhere that
it is better than overcorrection. The comment reads, "Good surface.
Many mirrors required to measure are overcorrection, but yours is undercorrection.
This mirror has enough resolution as 12.5 cm, because the degree of undercorrection
is small. A good mirror like this is very rare. Good luck for your
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