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Thanks Colin. That is exactly the sort of response I was hoping for. A nice summary of the current state of play.
I was planning to use my Microline 16 (KAF16200 with 6 micron pixels and 6 electron read noise) with this new scope (needs a 34.5mm corrected circle). But it would be nice to be able to use the Proline which is more demanding (needs a 52mm corrected circle).
Yes it does seem that these cheaper triplets could be very good but the focusers may be a bit small (2.5 inch is getting small in my experience, APSc sensor only).
For the Proline that would require CFF, Tak, TMB/APM or AP. A 3 inch focuser would be the minimum.
I am leaning towards the CFF 105/F6 but its a 9 month waiting list. Not that I need one straight away. They also have a 135mm that is available sooner but of course more expensive.
Perhaps I should have another look at the Taks. But by the time you get the rings, finder scope, angle rotator, adapters with the exchange rates being low it sounds like not much change from $10,000 for the 120. That's a lot for a 120mm scope.
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