Hi guys,
I've got a really annoying problem that I am struggling to solve so thought I'd ask the help of experts
Ok let me explain my setup - I've got a GSO 10" F5 newtonian, it's been flocked and I've also installed a moonlite focuser with the high res stepper motor. I've also purchased a Howie-Glatter 2" collimation laser with the barlowed attachment. What I've noticed is that lately, when I am imaging, I am constantly having to adjust the focus (talking about adjusting about 20-40 steps on the focuser every 10 minutes), and also my stars never seem to be rounded anymore.
I decided to set the scope up inside on the mount, get collimation right and then tilt the mount on the RA axis - I was shocked to see just how much the collimation moved! I'm pretty sure from what I can see, that the primary mirror doesn't move as it's the little black circle that is *slightly* bigger than the hole in the collimation tube, but seems to be either the focuser or secondary movement as the rings move way off centre?
The mirror is done up quite firm (springs are tensioned almost all the way in and locked quite firmly). The focuser appears nice and tight with no slop, all screws and bolts appear to be done up tight, but I just cannot for the life of me figure out what could be causing this?
I'm using the tube rings that came with the GSO and also the skinny dovetail as well so not sure if that's the cause. I've uploaded a Youtube video below to show you what I mean.
https://www.youtube.com/watch?v=AhOKBi8ljrA
Cheers, Mike