William Optics

Telescope ModelOTA Thread FocuserAdapter
Zenithstar 66M73x1FTF2025BCRA20-731
GT81, Megrez 80 & 90MM, Zenithstar 80M90x1FTF2025BCRA20-271
 FTF2015BCR-RPA20-3003-1
 FTF2535HDA25-2003-14
(NEW) GT-81 female threadM86x1FTF2535HD
WO 72mmM87x1FTF2025BCRA20-273
Older Megrez 90M76X1FTF2025BCRA20-226
FLT98 Carbon Fiber w/red non-removable ringM77.5×1FTF2535HDA25-2003-3
FLT98 Carbon Fiber w/red removable ringM102x1FTF3035B-AA30-1903-22
Megrez 102EDM102x1FTF3035B-AA30-1903-22
FLT98 w/gold ringM104.75X1FTF3035B-AA30-1903-2
GT102M104.75X1FTF3035B-AA30-1903-2
Zenithstar 105 & 110mmM114x1FTF3035B-AA30-1903-4
FLT110 w/TEC lensM115x1.25FTF3035B-AA30-1903-6
FLT110 w/TMB lensM115x1.0FTF3035B-AA30-1903-6A
FLT w/DDG stock focuserM113.5×1FTF3035B-AA30-1903-6B
FLT123 & Megrez 120M122x1FTF3035B-AA30-1903-FLT123
FLT132/Zenith Star 126M139x1FTF3545B-AA35-503-WOFLT132
FLT151, FLT152, FLT158M167x1FTF3545B-AA35-503-WOFLT152
FLT178M134x1FTF3545B-AA35-503-WOFLT178
Zenith Star 126 (2nd version)4.034″FTF3035B-AA30-1903-24-M

The 2.5, 3.0, and 3.5″ Feather Touch focusers will need an end cap and we have comp. ring and threaded end caps.