Here are some pictures of my 6 inch F8 Dual Newtonian Offset Binoscope I have just completed. Nearly all the mechanical parts are 3D printed.
I have always been so pleased with the views of my old trusty 6" F8 scope made over 30 years ago that I decided to make this Dual Newtonian Offset Binoscope. The 46mm of lateral offset between the individual scope axes provides for a very comfortable viewing position with the angled eyepieces. The angle the eyepieces make with the binoscope axis changes from about 55 degrees with an IPD of 55mm to 40 degrees when the IPD is opened up to 75mm. These angles all result in a comfortable viewing position from horizon to zenith. As can be seen in the 3rd photo there are conveniently located push buttons for the motorized X-Y convergence of the images and the lower buttons are for changing the motorized IPD from 55mm to 75mm. What has made this a practical design is the advent of inexpensive 3D printers. There are 20 individual 3D printed parts used in the construction of the binoscope and 12 lengths of aluminum angle. The cost breakdown is as follows:
2X6" F8 mirrors $260
1X 31mm secondary mirror $40
1X 46mm secondary mirror $50
2X Focusers $70
12 lengths of 3/4 inch aluminum angle $75
20 3D printed parts (Cost of the PETG plastic) $50 (you need to have a $400 3D Printer)
Corrugated plastic Light Covers $25
3 Motors for X-Y image and IPD adjustment $40
Miscellaneous screws and glue etc $50
Eyepiece cost not included, but two inexpensive plossls work well with the long focal length.
First light for this Binoscope was only yesterday but already I'm excited by the clean, crisp views with no CA and a useful magnification range from 38X with 32mm Plossls to 305X with 10mm Plossls and 2.5X Barlows.
I will be providing the .STL files of all the 3D printed parts on Thingiverse along with construction details on petertinkerer.com for anyone interested in building one of these binoscopes.
The weight of the binoscope is 25 pounds with eyepieces and the classic Dobsonian mount weighs 20 pounds so they balance each other and can easily be carried together.