Martin,
I use a C11 @f10 on a standard NEQ6pro mount.
I have an eFinder, flip mirror, spectroscope with three cameras, all up about 16-17Kg.
It needs 5 x 5Kg of counterweights
I don't do AP, but I can get a target star to sit in a slit gap of 20 micron almost indefinitely. Currently using 5 minute subs x 20 for spectral imaging.
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