Here are a couple other images from the same night, M81-82
& M101. I fought processing both of these because of sky glow
gradients in the background. You can see how bad in the thumbnails on my
top page. M101 was the worst.
The only thing different between
these two and the OCent shot later that night is they're both 60mins
exposures and the wind was dead calm, Sirius wasn't twinkling. My
ST-4 reported A=0's in RA with SA=2 for 3hrs except when advancing
film...joe :)