The Bahtinov or focusing mask is a brilliant aid to get a perfect focus. When the telescope is pointed toward a bright star, the mask generates a specific diffraction pattern that makes the focusing procedure easy. Adjust the focus of your telescope till you will see a symmetrical pattern.
The mask is laser cut from glossy black acrylic and has slots for the included bolts which makes it possible to clamp it onto either the outside or inside of your telescope tube.
Specifications
| 65mm - 100mm mask inner tube clamping range | 77 mm - 108 mm |
|---|---|
| 65mm - 100mm mask outer tube clamping range | 62 mm - 96 mm |
| 85mm - 120mm mask inner tube clamping range | 97 mm - 131 mm |
| 85mm - 120mm mask inner tube clamping range | 81 mm - 115 mm |
| 105mm - 150mm mask inner tube clamping range | 120 mm - 167 mm |
| 105mm - 150mm mask inner tube clamping range | 105 mm - 152 mm |
| 125mm - 180mm mask inner tube clamping range | 145 - 192 mm |
| 125mm - 180mm mask outer tube clamping range | 130 - 179 mm |
| 150mm - 200mm mask inner tube clamping range | 166 mm - 213 mm |
| 150mm - 200mm mask outer tube clamping range | 151 mm - 198 mm |
| 175mm - 220mm mask inner tube clamping range | 186 mm - 232 mm |
| 175mm - 220mm mask outer tube clamping range | 170 mm - 218 mm |
| 195mm - 240mm mask inner tube clamping range | 204 - 255 mm |
| 195mm - 240mm mask outer tube clamping range | 192 - 239 mm |
| 215mm - 260mm mask inner tube clamping range | 229 - 276 mm |
| 215mm - 260mm mask outer tube clamping range | 212 - 261 mm |
| 250mm - 290mm mask inner tube clamping range | 264 - 310 mm |
| 250mm - 290mm mask outer tube clamping range | 247 - 295 mm |
| 290mm - 340mm mask inner tube clamping range | 306 - 354 mm |
| 290mm - 340mm mask outer tube clamping range | 292 - 340 mm |
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
Otherwise, standard shipping charges apply. Check out our delivery Terms & Conditions for more details.
