William Optics 3.5 - Firm locking with one simple twist
The William Optics 3.5 Rotolock gives you direct control over your eyepieces. You lightly tighten the washer, and everything immediately sits firm and straight. No tilt. No play. You get a clear, stable image without fiddling with loose screws.

Quick change without disturbing your vision
The Rotolock works on the same principle as a Twist-Lock. You twist, it clamps evenly around the entire eyepiece, and you can immediately continue looking. This is ideal if you often change between magnifications. You stay in flow, and your telescope stays perfectly aligned.
Perfect match for FLT refractors
You screw the adapter directly onto the 3.5″ focuser of your FluoroStar refractor. On the eyepiece side, you get a generous 2″ opening. So you can continue to use all your large eyepieces and get the most out of your field of view.

Strong, smooth and stylish
The aluminum casing feels solid and remains stable even with heavy accessories. The blue finish gives your setup a sleek, professional look.
Specifications
Capacity
| Feature | Description |
|---|---|
| Ocular connection | 2″ |
| Connection on the other side | 3,5″ |
| Telescope connection | M63 |
General
| Feature | Description |
|---|---|
| Color | Blue |
| Design | Eyepiece adapter |
| Type | Adapters |
| Product Safety | Yes |





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