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William Optics Bahtinov Focusing Mask Telescope Tube/Dewshield Dia 172-235mm GR90

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William Optics Diffraction Spikes Bahtinov Focusing Mask - For Telescope Tube/Dewshield Diameter (NOT Telescope Aperture) from 172-235mm (6.77"-9.25") # BM-DS-GR90

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 telescopes that have an outside tube or dewshield diameter of 172mm – 235mm (6.77" – 9.25")


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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