Raymond Collecutt:
20" f3.8 with derotator run by Onstep.
Raymond Collecutt:
Onstep 20" f3.8 Dob.
Raymond Collecutt:
Belt drive DEC axis NJP
Raymond Collecutt:
Belt drive RA axis NJP
Raymond Collecutt:
Non standard Onstep max circuit for NJP
Raymond Collecutt:
Tak NJP Onstep controler