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SkyWatcher

 

Telescope Model OTA Thread  Focuser Adapter          
Equinox 66 M73x1 FTF2025BCR A20-731          
80/100/120 ED and Evostar 80/100/120
Non threaded 3.804" FTF2025BCR A20-292 OR        
    FTF2015BCR-RP A20-3003-8 OR        
    FTF3035B-A A30-1903-104          
Esprit 80 M109x1.5 FTF3015B-A A30-1903-28          
Espirit 100 M128x1 FTF3015B-A A30-1903-102          
Esprit 120/150 M147x1.5 FTF3035B-A A30-1903-103 OR        
    FTF3545B-A A35-503-103          
SkyWatcher Newtonians Non Threaded   FTF2025BCR A20-240 or A20-241          
SkyWatcher Equinox Refractors M84x1 FTF2535HD A25-2003-20          
                 
The 2.5", 3.0" and 3.5" Feather Touch focusers will need an end cap and the most popular end cap for the 2.5" focuser is the EC25-2005-1 which is a 2" compression ring end cap
For the 3.0" and 3.5" Feather Touch focusers for the Esprit Telescopes, the most popular end caps are the M65x1 threaded end caps (EC30-1905-65 and EC35-505-65)
                 

For the SkyWatcher Newtonians, which adapter needed will depend on which stock base that is on the telescopes

A20-240

Or

A20-241