Baader Hyperion Finetuning-Ring 28mm, M48/M48 - 2958228

Highlights

• Focal lengths Fine Tuning for Hyperion eyepieces (all focal lengths)
• Optical path length 28mm
• Spacer rings fit between the negative lens and the 2 "barrel, so that it matches the respective eyepiece to your needs.
• The 13 mm eyepiece transform e.g. no loss of quality in a 9- or 11 mm eyepiece.