Make a 2-inch eyepiece fit a 1.25-inch telescope holder. The SVBONY W2811D is a machined aluminium eyepiece adapter with a 1.25-inch nosepiece and a larger 2-inch eyepiece socket. Ideal when you need a physical size conversion without replacing your existing focuser or diagonal.
Built to make a secure connection
- 1.25-inch telescope end: fits a compatible 1.25-inch eyepiece holder.
- 2-inch accessory socket: holds an appropriately sized 2-inch eyepiece or accessory.
- Brass compression ring: distributes clamping pressure and helps prevent marks on the accessory barrel.
- Black anodised aluminium: durable metal body with a darkened interior to help limit unwanted reflections.
Dimensions and fittings
| Brand | SVBONY |
|---|---|
| Model / SKU | W2811D |
| Telescope-facing barrel | 1.25 inches (31.7 mm) |
| Eyepiece socket | 2 inches (50.8 mm) |
| Material | Machined anodised aluminium |
| Colour | Black |
| Retention | Thumbscrew with brass compression ring |
Before you order: important compatibility advice
This adapter provides a mechanical fit only. A 1.25-inch focuser has a narrower clear aperture than a true 2-inch optical path, so wide-field 2-inch eyepieces may experience noticeable vignetting and will not gain the field of view that a full 2-inch system can deliver. Some combinations may lack sufficient inward or outward focus travel. Check the eyepiece's weight and your telescope or diagonal's load capacity before fitting heavy 2-inch accessories.
Not the reverse adapter: to use a 1.25-inch eyepiece in a 2-inch focuser, you need a 2-inch-to-1.25-inch reducer instead.
What's included?
One SVBONY W2811D 1.25-inch-to-2-inch metal eyepiece adapter. Eyepiece and telescope are not included.