I've been photographing the ISS for over a year using an SVBony 6mm eyepiece.
Last night I tried a 4.7mm from Explore Scientific and got this image as it flew over Fort Worth, Texas.
12" Zhumell Dobsonian with re-coated mirror (bought used, so I don't know the year)
Manually tracked using RACI 8x50 viewfinder
Samsung Galaxy S9+ smartphone
Stock Android camera app with Pro mode function
ES 82° 4.7mm eyepiece
Shutter speed 1/350th
Bluetooth shutter button.
No processing or stacking.
I captured roughly 260 photos, of which 165 contained mostly non-blurred ISS images.
Here's the process that I follow: