Quote:
Originally Posted by Amaranthus
Yes Krishan, I've had it, as documented in this thread:
http://www.iceinspace.com.au/forum/s...d.php?t=124484
Look at the image and animation I did of it - look familiar? 
I fixed it by going to an OAG. Wonderful solution; I'd never go back to a guidescope now. Even short FL really do benefit from OAG, and for long FL, it's THE way to go. I really don't understand why many people are reticent to use OAG, it's easy, logical, and gives superb results. The only real key is to get a good guide camera (I use an ASI120MM). |
Thankyou Barry. OAG I am reluctant to go to at the moment for two reasons, namely the "apparent problem" of finding a guidestar given the small pickoff prism in comparison to the imaging FOV, and the relatively slow f ratio I am imaging at at present. I have a QHY5L-II, so i dont doubt I have the camera for such an endeavour.
I fully understand why people use an OAG, and also why people get put off by flex. Thankyou for providing the link to your animation/thread, that is EXACTLY what it looks like.
I did some more thinking and initially i thought the flex could not be due to gravity. But to completely understand my problem, I took pictures of the orientation of the guidescope with respect to the ground, and it is certainly in the realm of possibility that it is due to gravity.
5 microns could be due to felt compression. I will remove it and the glue and replace with very thin electrical tape (or a thin plastic strip). will see what that yields
.
I am not ready to give up on my guiding setup yet. THere are many improvements I can make. And this is using two orion tube rings, two munson rings and 3 losmandy DVAs to bolt the thing down!
but as i said, just want to make sure it is flex and not some other gremlin