Focus is sharp on the screen but not sharp on the picture. Turn off Live View and use the viewfinder and focus is slightly different. GIMP fixes a lot. 17.5" f/4.5 1/100 second ISO 100 prime focus.
As an experiment I did everything the same but at 1/500. Very dim but after GIMPing it:
Better off at 1/100.
ISO 100, 1/80th sec. 25mm eyepiece. I am not immediately sure how to calculate the magnification but I am guessing it is about 5x over prime focus.
Here I went to 12.5mm eyepiece. 1/5th sec. Image quality noticeably worse.
Why so much worse? I took video at several points. Some of them were all white. Wrong ISO? White supremacy? But this video at the same magnification will give a clue.
See the atmosphere waving at you? And perhaps a little vibration was pressing the shutter. (The stills were done with a 12 second delay.) No wonder resolution was so poor. That black line is not a rill. It only appears in the 12.5mm images, so likely a hair in the eyepiece.
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