Hey there Morton
The Megrez did do very well for an achromat. There was only a few minutes of uncontrollable violet at the umbral exit - of which theemerging sliver was so bright that I think all cameras, lenses and telescopes would have difficulty coping with anyway. The levels of contrast were incredible. I considered whacking a minus violet on, but then I would have lost the rest of it.
The middle sequence you are pointing out was taken at around 1/2 sec at ISO200. I did't track at all. I had it mounted to a Celeston fork mount witha base plate fitted in between the forks. It wasn't aligned as all I had to do was tweak it every few minutes for another shot.
Yours turned out damn well - and all within a city vista! How's the 90 going? I see that your WO collection is growing!
I'm going to look at the FLT132 soon.... I hope.
Cheers
Chris