Quote:
Originally Posted by multiweb
How did you manage to do that? With the holographic concentric pattern? So what the correct way of doing it?
|
How did I do that? Well, think of trying to tune a Ferrari using a sledge hammer. Specifically:
- Making secondary tip/tilt adjustments during a star test that were way too big ... more that 1/8 turn
- Making multiple adjustments to the secondary without writing down what adjustments I did.
- Making large primary tip/tilt adjustments without marking the starting points.
- Not using the collimation scope to establish a baseline view of the system. I have no idea what the factory setting looked like through the collimation scope.
I am fixing it now using the collimation scope and only small primary tip tilt adjustments during star tests after marking the starting points with a whiteboard marker on the adjustment screws (large nobs). Any secondary adjustments indicated during a star test need to be TINY, be done one at a time and carefully noted and the result analysed. Since the collimation scope says the alignment of the secondary is already correct, great care is needed.
Unfortunately, the holographic laser is hard to use in the confined space of the obs. It's fine to do radial alignment of the secondary and to get close with secondary tip / tilt, but it needs to project the rings at some distance I think to be able to fine tune - and I’m currently thinking of how to do this.
Quote:
Originally Posted by Joshua Bunn
Hi Marcus,was the drift you observed, without Protrack on and without autoguiding? simple flexure of the imaging train will have a similar effect to this I would imagine, which protrack will take care of.
|
Without protrack or autoguiding. Flexure would not manifest significantly (several arcseconds) in such a short time frame (60 seconds).
Quote:
Originally Posted by strongmanmike
It has been exciting for us to watch on, I for one marvel at your thoroughness Marcus and I have confidence that you may well in fact surpass your stellar efforts ...
Mike
|
Thanks Mike - very kind words ... after I chose to ignore the TOA-envy comment that is
