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Hello Blake
I have found both the ten and twelve to hold collimation well, and for a considerable period of time: i.e. I haven't found it necessary to do every time. I must confess, too, to using nothing more than an old film cartridge with a hole drilled in it to collimate - had to centre spot the mirror of the ten inch but I understand this is now done in the factory.
I was using the ten inch last night and was reminded that it is much easier to move around - the biggest of the grab and go?
cheers, jim
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