This extension tube is used to mount the extender-Q1.6x on the Takahashi FS-60 refractor (and SKY-90 or old FSQ-106 refractors). It provides the necessary extension to obtain the 1.6x ratio behind the extender.
The inner face of the ring is grooved and painted matt black to avoid stray light reflections. The tube features rubber knurling for easy gripping.
It has M42x0.75 threads (female to male) and the net spacing distance is 20 mm.
| Characteristic | Takahashi Vari-tube (S) 61-B |
| Item number | TKA00587 |
| Input mechanical interface | M42x0.75 thread (T-mount), female |
| Output mechanical interface | M42x0.75 thread (T-mount), male |
| Spacing distance | 20 mm |
| Size | Length 25 mm, diameter 47 mm |
| Weight | 25 g |
