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Did more test subs last night, shooting at 332" and things are improving. I have attached a single sub of the Lagoon. Star shape is improving. I used my other DSLR (which is full spectrum but not cooled, so is lighter than the main camera), and had much less collimation shift due to focuser flex. I suspect that ulimately, if I want to keep this scope, it will need the focuser replaced order to support the cooled DSLR. As to f8 sub timing, I suppose it's just a learning curve on my part after having shot at f5 for years I had a 'feel' for what was best for capture, and need to adjust to it.
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