With the addition of Baader's new Finetuning Rings, each Hyperion eyepiece can now function as four eyepieces! Available in 14mm and 28mm lengths. The finetuning rings are 2" OD and threaded M48 (filter thread) on each end, so they can be installed in-between the Hyperion's removable front negative element and main body.
High quality 2" extension tubes with twist lock facility. These are used for achieving focus when you don't have enough focus travel. They are very well made with a centralizing twist lock locking system at the top.