William Optics Bahtinov Focusing Mask Cap for 81 Series Telescopes - Red
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Bahtinov Mask and Cover for William Optics 81 Series Telescopes (includes GT81 and ZS81).
Available in three colors (Red, Gold or Blue; each sold separately). The new 81mm telescopes now come with this mask. But if you purchased this scope some time ago and do not have this mask, then you can buy it separately now.
William Optics' Diffraction Spikes is an ultra high optical transmission Bahtinov mask which produces the clearest, brightest and longest diffraction spikes facilitating focusing with ease and accuracy.
- Optical transmission: 92% and above (about 3 times brighter than traditional metal masks)
- Made with optical grade PMMA acrylic material
- ID = 104mm (4.09")
- OD = 108mm (4.25")
Other Information
- Country of Manufacture: Taiwan
Bahtinov Mask and Cover for William Optics 81 Series Telescopes (includes GT81 and ZS81).
Available in three colors (Red, Gold or Blue; each sold separately). The new 81mm telescopes now come with this mask. But if you purchased this scope some time ago and do not have this mask, then you can buy it separately now.
William Optics' Diffraction Spikes is an ultra high optical transmission Bahtinov mask which produces the clearest, brightest and longest diffraction spikes facilitating focusing with ease and accuracy.
- Optical transmission: 92% and above (about 3 times brighter than traditional metal masks)
- Made with optical grade PMMA acrylic material
- ID = 104mm (4.09")
- OD = 108mm (4.25")
Bahtinov Mask and Cover for William Optics 81 Series Telescopes (includes GT81 and ZS81).
Available in three colors (Red, Gold or Blue; each sold separately). The new 81mm telescopes now come with this mask. But if you purchased this scope some time ago and do not have this mask, then you can buy it separately now.
William Optics' Diffraction Spikes is an ultra high optical transmission Bahtinov mask which produces the clearest, brightest and longest diffraction spikes facilitating focusing with ease and accuracy.
- Optical transmission: 92% and above (about 3 times brighter than traditional metal masks)
- Made with optical grade PMMA acrylic material
- ID = 104mm (4.09")
- OD = 108mm (4.25")
Other Information
- Country of Manufacture: Taiwan