Precise locking ring for 2" eyepieces and adapter for pushing onto the barrel.

• Precise locking by two screws 
• For fixing or calibrating of the plug-in depth of 2" eyepieces or adapters - for example if you want identical focus positions. 
• Prevents from tilting through the safety notch when using compression rings. 
• Can also be used for making a calibration eyepiece for astrophotography.

The short adapter allows using 1.25" filters directly in front of the sensor.

• Male thread: T2-thread (male)
• Female thread: M28 filter thread / 1.25" filter thread (female)
• The adapter is so short that the female T2 thread of the ASI camera can be fully used for connection - see image at left