How to Use Telescopes : Schmidt-Cassegrain Telescopes
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meade or celestron?
JALLU75 2 months ago
Once the telescope is adjusted with this method, you should see Polaris always close to and within the center ring of a Telrad as you swing the mount's tines from the horizontal to the vertical position (Declination motion). At this point, you should be centered at or near the celestial North pole (CNP).
Using an eyepiece that gives you about a 40 arcminute FOV, you might be able to make out three stars (TYC4643-26-2, TYC4627-64-1, and TYC4661-2-1) that almost perfectly triangulate the CNP.
jcinaz 1 year ago
Another key element to this method is that Polaris must always be in the field of view as you swing the tines from horizontal to vertical (the Declination motion). Using a 8x50 finderscope gives about a 7 degree field of view (FOV), which is a bit much. A Telrad gives about a 4 degree FOV, which I find adequate. A Rigel Quickfinder gives about a 2 degree FOV, which should be optimum.
More to come...
jcinaz 1 year ago
The key thing to keep in mind about this method is that the OTA does not have to be perfectly parallel to the tines at the outset. But if you insist, use any device to measure the angle of the base (any arbitrary initial position will do) and then set the OTA to be at the 90 degree complement of that angle. At this point, the OTA is nearly perfectly parallel to the tines. After making the video adjustments several times, the OTA will be more accurately parallel to the tines.
More to come...
jcinaz 1 year ago
that was short
biggrex 1 year ago
wow fast :D
Chrisjr2007 3 years ago
cool video
will0ughby 3 years ago