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William Optics Star71 Four Element f/4.9 Imaging Refractor w/2.5" Focuser - Limited Blue Edition - A-WO71-IIBU

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William Optics has discontinued the Star71 Imaging Refractor - Blue, and we are out of stock. Here is a link to the William Optics 2" Refractors we carry at High Point. Hopefully, you can find a proper replacement in this selection. If we can be of further assistance, please don't hesitate to call us at 1-800-266-9590 or send an email, and we will be happy to help you. Thank you!

William Optics Star71 Imaging Refractor - Blue

Designed for astronomers looking for the ultimate astrophotography and CCD imaging instrument, the William Optics Star71 Imaging Refractor offers pinpoint stars at the extreme edge of a 45 mm imaging circle.

William Optics Star71 Imaging Refractor Highlights

  • 71 mm f/4.9 refractor optical tube
  • FPL-53 glass provides apochromatic performance free of color
  • Unique new patented construction with four elements in three groups with a 2-1-1 configuration, not an ordinary objective/flattener/reducer design
  • 45 mm full frame imaging circle is covered
  • Comes with a 2.5" dual-speed rack & pinion focuser, mounting rings, and a Dual Side dovetail
  • 2.5" (35 mm) focuser drawtube travel
  • Weight: OTA only: 4.19 lbs. (1.9 kg); OTA with rings and dovetail: 4.85 lbs. (2.2 kg)

Additional Information

Focuser drawtube ends in a male M48 thread. A wide M48 Canon EOS adapter ring is also included with the William Optics Star71. Similar rings are sold separately for other camera brands. This is not your ordinary 2" focuser tube with locking thumbscrews.

A 90º 1.25" dielectric mirror diagonal is available as an option (sold separately) for those who want to use the WO71 as a visual instrument. This diagonal includes a custom adapter that connects directly to the telescope focuser tube's M63 female thread; standard 1.25" diagonals are not compatible. The Star 71 refractor is not able to reach focus with larger 2" diagonals.