I was taking the photos on fairly solid, but a little wet, ground. I had two tripods set up. One was for the 800mm fd lens and the other was for the Tamron. Unfortunately, the head I was using for the 800mm was unable to solidly hold the lens at the high angle I needed when the moon was in the full eclipse position. Therefore, I used only the 150-600 for the red moon shots. The tripod I used for the Tamron was not as solid as the one for the 800, but I don't think that camera shake was the issue. I used a remote trigger (the CamRanger) so no vibration from that and was using live view. There was no real wind out at the time.
I have done several star photos before with other lenses (including the 800, a Canon 70-200 2.8 and a variety of wide angle lenses) and have not had had the stars come out in such a squiggly pattern before. Blurred yes, but consistently squiggly like this no. I first attributed the moon blur to the duration of the shutter, the length of the lens and the movement of the moon. However, that does not explain the squiggly stars. I need to go out again and try some star photos with the better tripod and with VC (IS) on and off to see if I can repeat the effect.
Thanks for help in brain storming this issue.
Kindest Regards, Lloyd