This Saturn was taken at f20 with a 9.25” SCT. Best 20% of 1000 100ms frames. It is softer than I would like but I cranked up the scale from prime focus. Shimmers were pretty bad.
Before Saturn there was Venus. This was best 20% of 1000 1ms frames. One percent of the exposure length of Saturn but it was f10 rather than f20. Shimmers were worse and there was some chromatic aberration due to the sky that I removed.