You can add the PrimaluceLab Esatto focuser to the list but there is no dedicated driver yet, it works with the Sesto Senso 2 INDI driver but with likely limited capabilities. I got mine very recently and installed it on my C8. It's a very nice and very solid piece of work; I can't wait to put it to work, under a cloudless sky.

You can also look at the Pegasus Astro DMFC (or whatever replaces it) as it can be purchased with an SCT adapter. I use a DMFC with my small refractor and it works very nicely. This option is cheaper than the Esatto but as it connects to the C8 focus knob, you are likely to encounter mirror shift issues.

The Esatto connects to the C8 rear flange and is a Crayford type focuser. You can pre-focus with the C8 focus knob, lock the mirror if your C8 supports it, and then use the Esatto to perform fine focus adjustments.

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