Applicable to MOST of the telescopes with M48 Camera Thread ( Except for certain optical factors )
- Cat 51 V1.5~WIFD
- Cat 61 WIFD
- Cat 71 all versions
- Cat 91 WIFD
- Ultra-Cat 108
- Pleiades 111
- Pleiades 181
- Lock the Rotator
- Take off the M48 adapter
- Lock the filter ( male thread ) inside the M48 adapter ( female thread )
- It is recommended to apply some lubricating oil on the threads first to avoid being permanently tightened.
- Put the adapter back