ZWO M54 Extension Tube 7.5 mm The ZWO M54-M54-7.5 is a threaded adapter ring with 7.5 mm nominal spacing. The manufacturer drawing specifies M54 × 0.75 interfaces and ±0.1 mm length tolerance.
Manufacturer model: ZWO M54 Extension Tube 7.5 mm · Specifications checked against manufacturer data on 2026-11-03
The ZWO M54-M54-7.5 is a threaded adapter ring with 7.5 mm nominal spacing. The manufacturer drawing specifies M54 × 0.75 interfaces and ±0.1 mm length tolerance.
ZWO describes this ring as a replacement for the original adapter ring on the FF65, FF107 and FF130 focal reducers. Use the required ring length for the specific reducer and camera train; the 7.5 mm and 10 mm versions are separate spacing options.
ZWO manufacturer documentation
Use the exact named-model manufacturer connection and operating instructions linked with this product. Optional parts and adapters require their specified spacing and power limits.
| Manufacturer variant | M54-M54-7.5 |
|---|---|
| Nominal spacing (mm) | 7.5 |
| Spacing tolerance (mm) | 0.1 |
| Threads | M54 × 0.75 male / female |
| Manufacturer application | Replacement original adapter ring for FF65/FF107/FF130 focal reducers |
ZWO M54 Extension Tube 7.5 mm The ZWO M54-M54-7.5 is a threaded adapter ring with 7.5 mm nominal spacing. The manufacturer drawing specifies M54 × 0.75 interfaces and ±0.1 mm length tolerance.
Manufacturer model: ZWO M54 Extension Tube 7.5 mm · Specifications checked against manufacturer data on 2026-11-03
