Posted 21 October 2012 - 05:14 PM
The graphs are pretty much the same for all runs. There is always a spike at the same place in the frequency spread. it appears at the 8/3 pe error location, the rest of the errors are random and change between imaging runs. Is this because the 8/3 PE error of my mount (runs about 75% of the worm PE) is too hard to guide out?
I am using my setup for live video work and have just started guiding. The mount cannot be used for longer integrations without guiding.
Posted 21 October 2012 - 10:45 PM
Looking at your guiding graph that's about +/- 0.8" - or is that +/- 0.8 pixels?
If it's already in arc-seconds, then you aren't gonna get any better than that.
I bet your RMS is less than that, maybe 0.4" ?
That sort of performance is as good as it's going to get. I think guiding a C11 tightly on a CGEM is... not really doable. Try using a reducer..
Alternatively, try an OAG. Might help. Tighter guiding intervals too. Metaguide? Frank says sub 1" is consistently possible with MG on CGE-class mounts.
Posted 22 October 2012 - 11:11 AM
Post my miraculous CGEM resurrection, here is a guiding graph I took (the guider is a 50mm guidescope). But you can see my residual PE and the largest is also the 8/3. Interesting that the fundamental is so tiny it's lost in the noise. But then I have an Aeroquest worm.
Posted 22 October 2012 - 01:06 PM
But I don't think you can manage that without OAG (flexure).