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Condition:
This is a used William Optics Bahtinov focusing mask for 75-110mm apertures. It is in excellent condition and it comes in its original box.
Description:
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 |