I had clouds in and out .... some photos taken at his ISO,some at long exposure to get through the clouds per say. and some long exposure which got stars and airplane trails. What fun until the heavy clouds rolled in again.
The one I posted earlier had some sharpness issues due to use of ISO 100 early on.
I found ISO 1600 to be too grainy- best I found thru trial and error was ISO 400.
Here is one of those:
F/13
1.5 seconds
ISO 400
300 mm (cropped several times).