Extension tube Hyperion Finetuning ring 14mm

Hyperion 14mm fine tuning ring (2" extension, M48 female / M48 male, 14 mm optical path)

Focal length fine tuning for Hyperion eyepieces. Up to 40% reduction in focal length. Spacer rings between the negative lens and the 2" barrel to adjust the respective eyepiece focal length to suit your requirements. Turn the 13mm eyepiece into a 9 or 11mm eyepiece for example, without loss of quality.

The fine tuning rings can also be combined!