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William Optics Bahtinov Focusing Mask Telescope Tube/Dewshield Dia 105-148mm GR55

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William Optics Diffraction Spikes Bahtinov Focusing Mask - For Telescope Tube/Dewshield Diameter (NOT Telescope Aperture) from 105-140mm (4.2-5.5") # BM-DS-GR55

Latest version with holes and diffration ridges as pictured above. Older version just had diffraction ridges.

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
  • Easy to mount on many small telescopes that have an outside dewshield diameter of 105mm – 148mm (approx. 4.2" – 5.8")


Note: Occasionally, the product you receive might have a slightly different cosmetic appearance or labeling than what is shown. This can often change from batch to batch according to the whims of the manufacturer. However, you will always receive a brand new, original product as described above.

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