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64mm Aperture Mask for William Optics Star 71 Refractor For Sale

Price - $10.00

Ad Number: 51531

Posted: 14 Apr 2015

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Many William Optics Star 71 refractors exhibit an inverse diffraction spike artifact. This 3D printed 64mm aperture mask normalizes the stars without having to open up the scope and possibly do damage trying to adjust it out. It easily fits over the dew shield and can be installed in the dark. The mask changes the f-ratio from 4.9 to 5.43. I have included a before and after image at 100%. $10 includes free shipping in the CONUS. Will ship international, but will charge actual shipping cost. The telescope is not for sale, only included to show how the mask is installed. PayPal, check, or money order accepted. Thanks for looking.


  • Condition new
  • Location Arkansas, USA

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