The T2 Quick Changer and 360-Degree Rotator by Teleskop-Service Ransburg:

This T2 adapter helps solve problems encountered during both visual observation and imaging. Not only does this adapter give the T2 an exceptionally quick and short exchange option, it also features 360-degree rotation for optimal framing. Includes two knurled screws for safe locking and comfortable functionality even for observers wearing gloves. Contributes only 5.5 mm optical length, ideal for systems with restricted back focus.

Teleskop-Service Ransburg T2 Quick Changer and 360 deg Rotator Features: 

• Short 5.5 mm optical length is ideal for systems with restricted back focus
• Self-centering allows accessories to stay locked on the optical axis
• Takes only seconds to connect and disconnect
• 360-degree rotation for optimal framing
• No tilt or bending even under higher load
• Precision machined ring dovetail features two locking screws

• Effortless framing of photographic targets
• Speedy transfer for cameras or auto guiders
• Simple guide star procurement with 360-degree search field

• Telescope side thread: T2 female (M42 x 0.75)
• Camera side thread: T2 male (M42 x 0.75)
• Optical length without T2 male thread: 5.5 mm
• Outer diameter: 67 mm