William Optics Star 71mm APO f/4.9 Refractor Telescope

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William Optics Star 71mm APO f/4.9 Refractor Telescope   Discontinued
Item # WO-A-STAR71
  • The Star 71mm f/4.9 Imaging refractor is according to William Yang of William Optics, " the best imaging scope we've ever built."
  • Like it's predecessor, the ZenithStar 71, the Star 71 is highly portable. Weighs only 6 pounds and is just over 1 foot long. This telescope can go anywhere including under an airplane seat! It's a great grab-and-go scope for the digital astrophotographer.
  • The optical design of the Star71 is a unique, patented design using five element FPL-53 fluorite glass in three groups to produce color free, pin-point images across a flat field. No flatteners or reducers are needed.
  • The lens cell, powder-coated white, gold-accented optical tube assembly, and dew shield are all CNC-machined.
  • A heavy- duty 2.5" rack and pinion 10:1 dual-speed focuser is super sturdy and will not slip when locked down, even with heavier cameras attached.
  • This package includes mounting rings, a 150mm Vixen style dovetail and a wide M48-Canon EOS adapter ring.


William Optics Star 71mm APO f/4.9 Refractor Telescope w/ Rings and Dovetail

"This is the best imaging scope we ever built" says William Optics founder and CEO, William Yang, in describing this new apochromatic refractor.

In addition to utilizing the highest quality FPL-53 fluorite glass, five elements are configured in three groups- a unique, patented 3-1-1 design- not the conventional objective/flattener/reducer design, that affords pinpoint stars from edge to edge covering a 45mm full frame imaging circle-- an astrophotographer's dream especially since this little jewel of a telescope includes a robust 2.5" dual speed rack and pinion focuser that even incorporates a temperature gauge. The drawtube terminates in male M48 thread to which a wide M48-Canon EOS adapter ring (included) can be attached.

This is not a conventional 2" focuser tube with locking thumbscrews.  For those wishing to use this very portable telescope as a visual instrument, an optional 1.25" 90 degree dielectric mirror diagonal is available separately.  The diagonal comes with a custom adapter that connects directly to the telescope.  (Please note:  standard 1.25" diagonals are not compatible with this scope which also will not reach focus with larger 2" diagonals.

The CNC-machined optical tube assembly, that weighs no more than six pounds, is finished in William Optics traditional pristine white with gold trim.

Additional Information

Additional Information

Manufacturer William Optics
Telescope Series William Optics Star
Optical Design Refractor - Apochromatic
Mount Type None - Optical Tube Only
Warranty 1 Year Warranty
Telescope Aperture 71mm
Telescope Focal Length 348mm
Telescope Focal Ratio f/4.9
Tube Color or Finish Gloss White
Dew Shield Included? Yes
Finder Included None
Focuser Size 2.5"
Focuser Style Rack & Pinion
Manual or Electronic Focusing? Manual
Focusing Speeds Two-Speed
Total Telescope Weight 6.2 pounds

Customer Reviews 1 item(s)

Quality and Service is amazing!
I purchased this Star71 from OPT and have to say it came highly recommended for astrophotography and doing more wide field shots. I have not been able to use it yet but the quality of it is amazing! Todd at OPT has been nothing but amazing and helpful with every purchase and will continue to do business with him for a long time.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by GJewison / (Posted on 9/30/2015)
Included Items

Included Items

  • William Optics 71mm Star Refractor OTA
  • Mounting Rings
  • Vixen Style Dovetail
  • M48 Canon EOS Adapter Ring
Questions & Answers

Product Questions

What is the back focus requirement from the back of the M48 thread to the chip?
Will the WO Star 71 work with the TV Bino Vue?
Can you supply the optional diagonal for this telescope?

Do you have a part number and price for it?
Are there any Optec motor focusers that work with this? Would like to use a DSLR/motor focuser on this for automated imaging runs with Sequence Generator Pro.
Are there any field flatteners or reducers that are recommended?
Is the William Optics 90-degree diagonal (Item # WO-M-P90) compatible with this scope? Or is there a new diagonal for visual viewing in development?         
Will this optic handle a full frame chip or APS-C only?
Would this scope be able to do eyepiece projection with the Baader Hyperion Zoom eyepiece (with or without its barlow attachment)? If so, what adapters would be necessary to mount the eyepiece?
Is it suitable to use with STL 11000 +AOL unit ? backfocus,imaging circle,lifting capacity of focuser?
Does this scope accept Orion manual filter wheel with Baader Filters, and a Canon 60Da camera? Can focus be achieved in this setup?
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