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I'll come out of retirement long enough to say that a friend of mine had
a Coulter 17.5" about 35 yrs ago,[also Sonotube], had a very nice mirror,
and gave terrific lunar views at 750x on nights of good seeing. [which was most nights, as we averaged 300 or so cloudless nights per year] A friend of
his had the 29", but I never had the good fortune to observe with it.
raymo
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