Yeah the ASI1600 looks like a great camera. For guiding I prefer to use a QHY5L II because of it's smaller size but the QHY and ASI120 use the same sony sensor making them almost identical. I had a feeling that you had already been down the path of experimenting with the DSLR for planetary but thought that I'd mention it just in case.
I forgot to mention that I saw your C/2015 ER61 and Carina pics from the other forum awesome stuff. Comets look like tricky objects to capture. I'm hoping to try Carina as my first target when I get the 1600, but for now there's still lots to learn and deal with so it's just about getting on the band wagon and enjoying the ride.
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