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Its funny that so many people look at this like its either
A - A brand new never before considered solution.
B - Silly because you're guiding through filters, potentially tight bandpass narrowband and that will somehow be unworkable.
A - SBIG were making self guided (dual sensor) cameras in the early 2000's... This is not a new concept by a long way..
B - PLENTY of people used them with stunning success through all manner of filters, and different optical systems. Everything from the ST7ME through to the STL-11000M... These older CCD's required far longer exposures than the modern cmos cameras, the guide sensors in the cameras were smaller, with far fewer pixels than modern guide sensors, and yet people would still have a self guided 35mm sensor in a fast refractor like an FSQ106 with the reducer (~f/3.9) and be quite comfortable running ~1200s subs night after night, year after year, using 6 and 3nm narrowband filters... Equally, something like an ST10XME on a 10~12" F/10 SCT using a tiny guide chip through 3nm narrowband filters.
As with everything, I think people get so caught up in the fine details of equipment and end up overthinking everything.
Dual chiped cameras have existed for decades, and have worked brilliantly for MANY MANY people... Just check from 2005~2015, how many APOD's came from SBIG cameras, MOST of which would have been self guided... Sure, some people used a remote guide head on their SBIG, but plenty of people didn't..
If another company would produce a dual chip camera, I'd be all over it.. I miss my old self guided SBIG's, but at the same time I've seen more than enough horror stories about ZWO to not buy their products..
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