Nice images Dave - yeah it seems to be tricky to see much difference over those three days. You've inspired me to do a similar comparison with a set of images over the past couple of weeks (I'm still processing them). The brightness difference is also not obvious across my 24th, 27th & 29th images (there, but slight). By the 6th September, the rings are visibly quite a bit darker.
It's a tricky comparison to do, because seeing, transparency, strength of sharpening, colour balance will all have some effect. But we both have a similar result I think for the 24th & 27th.
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