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Francisco,
I'm currently running a DDM85 standard (NOT Basic) with a 300mm f/8 RiDK and a G4-9000 camera - so it's 2400mm focal length, 1''/px, and relatively fast data acquisition (~33% faster than 16803 because of the 12micron pixels).
This is easily capable of doing the 10min subs I need for narrow band and the 5min RGB is a no-brainer. FWHM analyses of my subs is always seeing limited, which at my site runs between 1.8" and 3".
It isn't only a question of encoders, but the software and direct drive motors together and how the system tracking is achieved. The pre-imaging track correction system of the ASA package (MLPT) has no equal that I'm aware of.
I also own a DDM60. When I was getting used to it, I ran a tracking test (scope was a 900mm focal length Newtonian). I shot 12 x 5min subs without dither, and analysed them in Pixinsight. The reported maximum drift over the hour was 0.6px ie <1''.
Regarding ASA, they are moving heavily into the professional market, as is Officina Stellare. I always had very good response from ASA when I ran into problems with the DDM60. But I think the 85 is a far more "bullet proof" unit, and I've never had any grief with it at all.
If you are running a 12.5" or 14" CDK I would not expect you to have any problems, at least up to the 10min sub time.
The ASA system is a unique beast, and the learning curve is quite different. Balance, for example is super-critical, regardless of the load, and motor tuning is also important.
I have no experience running remotely with my set-ups, so I can't comment on that. However, there are others who regularly do this.
Hope this helps with your decisions.
Mark
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