Focusing has never been easier
The William Optics 172-235mm focus mask helps you focus quickly and precisely. It is made of high-quality acrylic glass with 92% light transmission. This keeps your image clear and sharp, even with faint stars.
Clearer bending pattern
The imprint pattern of the mask is three times more pronounced than classic metal masks. You can see the curve better and find the perfect focus faster.
Easy to use
The mask fits telescopes from 172 to 235 mm in diameter. You simply place it over your telescope and you are instantly ready to focus. The acrylic glass provides a clear and high-contrast image.
Specifications
General
| Feature | Description |
|---|---|
| Color | Transparent |
| Material | Acrylic |
| Diameter (mm) | 172-235 |
| Type | Mask |
| Design | Focus Mask |
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