Sky-Watcher 2-inch 50 mm extension This extension adds 50 mm of physical spacing between a 50.8 mm push-fit focuser or accessory holder and a matching eyepiece or camera adapter. It is useful when the optical arrangement requires the accessory to sit farther out to reach focus.
Manufacturer model: 2-inch extension tube 50 mm SW0186 · Specifications checked against manufacturer data on 2026-11-04
This extension adds 50 mm of physical spacing between a 50.8 mm push-fit focuser or accessory holder and a matching eyepiece or camera adapter. It is useful when the optical arrangement requires the accessory to sit farther out to reach focus.
Connections
The telescope-facing end is a male 50.8 mm barrel and the accessory end accepts the same nominal barrel diameter. The aluminium body provides a rigid spacer. A 48 mm filter thread is also listed.
Focus requirements
The tube contains no optical elements and does not change the telescope’s focal length. Check the required outward extension and available focuser travel before choosing a spacer.
Compatibility notes
Exact SW0186 50.8 mm / 50 mm extension identified. Mass and full external dimensions are not published.
Additional specifications
Extension length (mm)
50
Accessory side
50.8 mm female receptacle
SW0186
Data sheet
Filter thread
48 mm filter thread; pitch not specified
Finish
Black anodised
Material
Aluminium
Reference
SW0186
Telescope side
50.8 mm male push-fit barrel
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Sky-Watcher 2-inch 50 mm extension This extension adds 50 mm of physical spacing between a 50.8 mm push-fit focuser or accessory holder and a matching eyepiece or camera adapter. It is useful when the optical arrangement requires the accessory to sit farther out to reach focus.
Manufacturer model: 2-inch extension tube 50 mm SW0186 · Specifications checked against manufacturer data on 2026-11-04
