This 40mm extension tube is very helpful if your focuser doesn’t have enough back focus, particularly in astrophotography where back focus is critical.
Spec:
- Material: Barrel made of black anodized metal
- Telescope-side: T2 female thread (M42x0.75)
- Camera-side: T2 male thread (length 4 mm)
- Optical path length: 40mm excl. male thread
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