Astro Tech/GSO/TPO Ritchey–Chrétien
RC/TPO Telescopes
| Telescope Model | OTA Thread | Focuser | Adapter | |
| 6/8″ RC | M90x1 | FTF2015BCR | A20-271 | OR |
| FTF2015BCR-RP | A20-3003-1 | OR | ||
| FTF1515BCR / FTF1515BCR-DS | A15-1503-2 | |||
| 10/12/14/16″ RC | M117x1 | FTF3015B-A | A30-1903-40 | OR |
| FTF3215B-A | A32-3203-40 | |||
| OR | ||||
| FTF2015BCR | A20-272 |
The 3.0″ Feather Touch focusers need an end cap and the most popular end cap for the 3.0″ focuser is the 2″ compression ring end cap but we also have threaded end caps for a more secure image train and these end caps are sold separately