Choosing and Using 2" Diagonals for Schmidt-Cassegrain and Maksutov-Cassegrain Telescopes
- 1. The Advantages of Using a 2" Diagonal
- 2. Installing Dedicated 2" SCT Diagonals
- 3. Installing Refractor-Type Diagonals and a 2" Visual Back
- 4. Direct Coupling the Diagonal Body with the Telescope
- 5. Diagonal Clearance Considerations
- 6. Attaching a 2" Diagonal to a Maksutov-Cassegrain Telescope
- 7. Final Considerations
- 8. Conclusion
Figure 1 – 2" SCT diagonals from (left to right) Celestron, William Optics, and GSO. The telescope side of each diagonal has 2"-24 threads that attach directly to the rear of the optical tube of most Schmidt-Cassegrain telescopes.
1. The Advantages of Using a 2" Diagonal
Most Schmidt-Cassegrain telescopes (SCTs) come with an OEM 1.25" star diagonal and a 1.25" visual back. The