The 2-Inch Adapter by Explore Scientific:

This adapter allows you to attach the 3-inch 0.7X Field Flattener Focal Reducer (ES-FFFR507X-00) on optical tubes with a 2-inch focuser.

This adapter also allows you to adapt the 3-inch Diagonal to a 2-inch focuser draw tube. 

 

Diameter: 76 mm (3-Inch)

Height: 36 mm (1.42-Inch)

Weight: 0.15-pounds (0.08 kg)

 

OPT Product Number: ES-510364

•  Attach the 3-inch 0.7X Field Flattener Focal Reducer (ES-FFFR507X-00) on optical tubes with a 2-inch focuser