Hyperion Fine Tuning Ring 14mm (2 "extension, M48 female. / M48 male, 14 mm optical length)
Fine tuning of focal length Hyperion eyepieces. Up to 40% shorter focal length. Spacers between the negative lens and a 2 "barrel, so that it matches the respective eyepiece to your needs, the 13mm eyepiece as you transform without loss of quality in a 9 -. Or 11 mm eyepiece.
The finetuning rings can also be combined!
