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The new Optical acrylic sheet offers 92% of light transmission that gave you the highest and brightest diffraction Spikes for Focusing - about 3 times brighter than traditional bahtinov masks!
Includes metal pegs to hang the mask over the front dew shield while focusing.
Select the size appropriate for your telescope or lens.
| Model |
MM | Inches |
| BM-DS-GR45 | 75 - 110 | 2.9 - 4.3 |
| BM-DS-GR55 | 105 - 148 | 4.1 - 5.8 |
| BM-DS-GR90 | 172 - 235 | 6.7 - 9.2 |
| BM-DS-GR150 | 243-308 | 9.5 - 12.1 |