Astro T-2 System spacer (Fine-Adjustment) rings, available in thickness 0.3mm (black), 0.5mm (red), 1mm (gold). Very thin ring for finetuning in T-2 eyepiece projection. Rings with T-2 inner diameter without threads. Fits between all T-2 threads, equals approx. 2/5 (0.3mm), 2/3 (0.5mm) respectively 1 1/3 (1mm) turn of rotation. Rotation may differ slightly. Prevents binding between two T-2 threaded parts.
