Before I go off and get another, I assume there shouldn't be any play between a (Canon) t-ring and the camera when connected? Mine has a tiny bit of rotation which I suspect is sometimes causing star trails.
Mine does, and it's Vixen made. Just a TINY amount. So, when imaging, I apply a seal of metal tape along the top edge, pressing it down completely. No rotation issues now.
Forgot to do it last time out, and yes, small star trails on a totally windless, calm night of perfect seeing and guiding.
So it's not just me. Glad we got that sorted. I can't remember if there was any play in it when I first got it. Sounds like a bit of tape will have to do. What's this metal tape that you speak of Lewis?
You can buy metal tape at various places - Bunnings etc. I actually got my couple rolls at Aldi for like $2.99 each.
VERY adhesive, and backed with aluminium (I think!) You can press it and conform it PERFECTLY to seal gaps etc.
They use a higher grade of this tape in aviation for quick non-structural (I HOPE!) repairs. Ask Col . Once saw a Mooney with about 2 foot of the stuff on one leading edge.
. Once saw a Mooney with about 2 foot of the stuff on one leading edge.
