Adjustable 1.25 "diameter extension from male T2 (M42 * 0.75) to female T2 (M42 * 0.75), with sliding counter ring. Total length 16 mm, travel range 13 mm. Particularly useful in setting the correct distance for astrophotographic elements (mainly cameras and guiders, OAG, projection connectors).
• overall length: 16 mm
• material: metal
• threads: male T2 / M42 / female male T2 / M42
• producer: GSO, Taiwan