Upgrading the Focuser of Your Schmidt-Cassegrain Telescope
- 1. Introduction
- 2. Microfocusers
- 3. External Focusers for Schmidt-Cassegrain Telescopes
- 3.1 The Basics of SCT Threads
- 3.2. Mounting and Using SCT Focusers
- 3.3 Types of External SCT Focusers
- 4. Selecting an External SCT Focuser
- 4.1 Telescope Backplate Considerations
- 4.2 Telescope Mount Considerations
- 4.3 Application Considerations
- 4.4 Increase in Operating Focal Length of Telescope
- 4.5 Possible Diagonal Considerations
- 4.6 Use of SCT Focal Reducers
- 5. Specifications and Features of Some Popular SCT Focusers
- 6. External SCT Focusers for Maksutov-Cassegrain Telescopes
- 7. Summary