Many years ago I read about a funny kind of telescope design used at the Stellefane Convention. It was called the "Turret Telescope". It used a perforated flat to direct the star light towards a parabolic mirror, and the parabolic mirror was aimed at the flat, such that the focused image went through the hole in the flat. The eyepiece then viewed the image from the other side of the flat. The observer viewed the image from the inside of a large polar aligned turret.
http://www.stellafane.com/history/history6.html
Here is my setup to get the same kind of image. (Sans Turret) I could only slightly tip the telescope towards some low stars since I did not have a mounting yet. Sirius looked great, and lots of little faint stars all around it. The in and out of focus images looked like a refractor with a very small black dot in the center from the perforation. I was using a 10" mirror and flat combination with a 1.2" hole giving 12% obstruction.
I hope to get these optics installed in an aluminum tube with a large oval cutout to bring the light in from the side. Baffling this scope will be a challange.
Sincerely,
David Simons
http://www.stellafane.com/history/history6.html
Here is my setup to get the same kind of image. (Sans Turret) I could only slightly tip the telescope towards some low stars since I did not have a mounting yet. Sirius looked great, and lots of little faint stars all around it. The in and out of focus images looked like a refractor with a very small black dot in the center from the perforation. I was using a 10" mirror and flat combination with a 1.2" hole giving 12% obstruction.
I hope to get these optics installed in an aluminum tube with a large oval cutout to bring the light in from the side. Baffling this scope will be a challange.
Sincerely,
David Simons
Attached Image: