Post your home made scope
Posted 22 January 2013 - 05:23 PM
- Deven Matlick, mattyfatz, Chassetter and 10 others like this
Posted 22 January 2013 - 05:52 PM
Here are the two scopes I have built, a 16" dob which I only have one photo handy. Guy grunting behind it is not me
The other is the 12.5" rc I did a little while back.
- Venetia2004, Deven Matlick, Rob McKenna and 2 others like this
Posted 23 January 2013 - 02:00 AM
For my 20" f/4 ballscope, the collimation is indeed done from the front. The silvery bits you can see around the mirror are the face clips that keep the mirror from falling out. I can use the screws that attach the top ring to the truss poles to effectively lengthen or shorten the truss poles. Depending on your point of view, this either A) tilts the ball relative to the truss or B) tilts the truss relative to the ball. Either way, I can get it so that the optical axis of the primary mirror goes through the middle of the focuser. Since the truss is a hexapod, I could also use the truss screws to tilt the secondary. However, for the sake of simplicity, I use the usual collimation screws on the back of the secondary to tilt it so that the truss screws are just for primary mirror collimation.
Posted 23 January 2013 - 02:20 AM
Here are the two scopes I have built, a 16" dob which I only have one photo handy. Guy grunting behind it is not me The other is the 12.5" rc I did a little while back.
As I know Jason I thought I would point out that the guy in the rc pic is not him either
Posted 23 January 2013 - 06:48 AM
- Deven Matlick, mattyfatz, Earthbound1 and 1 other like this
Posted 23 January 2013 - 11:33 AM
Mike, I fell in love with your ball mount but frankly, how hard is it to collimate with the trusses instead of the primary mirror?
Posted 23 January 2013 - 12:28 PM
- BillHarris likes this
Posted 23 January 2013 - 01:25 PM
The one open Scope reminds me of D. Dillworths Dall Kirkham Folding scope that was in Sky & Telescope some years ago.