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ZWO 16.5mm length spacer with M48 threads on both sides (one male and one female). Included with some of their full frame cameras. Allows you to obtain precise spacing for certain ZWO setups with reducers, correctors and flatteners that require a 55mm backfocus setting. For example, you can use this item with ZWO cameras with a 17.5mm backfocus coupled with their M54-M48-21 adapter (21mm) to get to 55mm (17.5 + 21 + 16.5mm) if required.
This item can also be used as a short 2" nosepiece with M48 threads. Made of aluminum and black anodized.
Specifications:
- Male thread specification: M48x0.75
- Male thread length: 4mm
- Female thread specification: M48x0.75
- Female thread length: 8mm
- Total length: 20.5mm
- Optical length: 16.5mm
- Clear aperture: 43.2mm
- Outside diameter: 50.7mm
- Weight: 0.7oz