Astro Days Thru June 26: Exclusive Member Coupon Savings
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Products and offers subject to change without notice. All Astro Days promo sales are final. No returns or exchanges.
Yes, our inventory is accurate!
Qualifies Towards Free Ground Economy Shipping (CONUS Only) For Most Orders Of $149 Or More
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 |