How to best balance a newtonian on an eq mount?
Posted 06 September 2013 - 04:51 PM
Many Pictures of newtonian astrographs - ASA, Orion optics and others - shows the tube attached to the mount in such a way that camera hangs straight down when mount is in home position. Is there some advantage to that balancing-wise or other.
It feels a Little insecure to have filter Wheel/guider/camera hanging like that; even if I make some security Cable so the stuff doesnt drop on ground it could easyly drop just a Little.
Posted 07 September 2013 - 05:00 PM
Posted 07 September 2013 - 09:49 PM
First, set the RA axis horizontally and balance the OTA (Dec axis) in that plane.
Next, balance the RA axis in two ways: for imaging in the East, balance it slightly counterweight heavy and mark the counterweight shaft. I use electrical tape. Now, do a flip and balance the RA axis slightly scope heavy and, once again, mark it. Now you know where the counterweights need to be positioned depending on which side of the meridian you are working on. Doing this ensures that the worm gear stays engaged.
Now comes the fun. Place the RA axis horizontally and point the scope vertically. Now balance it that way. This will require that you rotate the OTA one way or the other until you let go of the scope and it remains in the vertical.
Lock it down and you should be fine.
Posted 12 September 2013 - 11:24 AM