Focusing without fuss
The William Optics 243-308mm focus mask helps you focus quickly and precisely. It is made of optical acrylic glass with 92% light transmission. This keeps your image clear and sharp even with faint stars.
Clear bending pattern
The mask has a pattern that bends three times stronger than classic metal masks. You can see the lines clearly and find the perfect focus faster.
Easy to use
The mask fits telescopes from 243 to 308 mm in diameter. You simply place it over your telescope and you are ready to focus. The acrylic glass provides a clear, high-contrast image.
Specifications
General
| Feature | Description |
|---|---|
| Color | Transparent |
| Material | Acrylic |
| Diameter (mm) | 243-308 |
| Type | Mask |
| Design | Focus Mask |
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