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William Optics ZenithStar 81, f/6.9 OTA. FPL53 doublet APO, 2.5” R&P Focuser Refractor
William Optics ZenithStar 81, f/6.9 OTA. FPL53 doublet APO, 2.5” R&P Focuser Refractor

William Optics ZenithStar 81, f/6.9 OTA. FPL53 doublet APO, 2.5” R&P Focuser Refractor

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on backorder at our suppliers and may have longer delays for the delivery. Contact us for stock status.
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Your Price: CAD1,249.00
Retail Price:CAD1,299.00

Your Savings:CAD50.00(4%)

Usually ships in 5-7 business days, if on backorder ETA 4-6 Weeks
Part Number:

Choose Options or Accessories if Applicable

Model Selections
A-Z81RD ZenithStar 81, f/6.9 OTA. FPL53 doublet APO, 2.5” R&P Focuser in Red
A-Z81GD ZenithStar 81, f/6.9 OTA. FPL53 doublet APO, 2.5” R&P Focuser in Gold
A-Z81RD-AP ZenithStar 81, f/6.9 OTA. FPL53 doublet APO, 2.5” R&P Focuser in Red + P-FLAT6AIII. [+CAD189.00]
A-Z81GD-AP ZenithStar 81, f/6.9 OTA. FPL53 doublet APO, 2.5” R&P Focuser in Gold + P-FLAT6AIII. [+CAD189.00]
DIAGONAL
EYEPIECE
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FOCUSER
PHOTO ACCESSORIES & FILTERS
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Product Highlights
  •     81 mm Aperture f/6.9 Imaging Refractor Telescope
  •     FPL-53 glass for color free Apochromatic performance
  •     Covers full frame imaging circle (44 mm)
  •     2.5" R & P Focuser
  •     Colors: 3 colors available, Blue, Red, Gold
  •     Includes Mounting rings and Vixen style dovetail
  •     Dovetail is dual type - flip over to get Arca Swiss plate
  •     Weight: 3.53 kg
  •     Includes Interchangable Camera Mount
  •     Includes Dust Cover with built-in Bahtinov Mask

The William Optics ZenithStar 81 APO Telescope is a high quality Apochromatic Imaging and visual use telescope with an aperture of 81 mm and a focal length of 559 mm or an f-ratio of f/6.9. This ZenithStar 81 APO Telescope can also be used with an interchangable camera mounting system, with various T-mounts for cameras (not included).

The William Optics ZenithStar 81 APO Refractor is available in three colors, Blue, Red, or Gold. Choose the color of the telescope you wish to order from the drop-down menu above. All models have the same price.

If you wish to take great astro-images with a high quality APO refractor, this William Optics ZenithStar 81 APO Telescope is a great way to obtain your imaging goals. Its FPL-53 glass air-spaced doublet lens design provides images with extreme sharpness, clear details, with APO grade color correction.

Includes a dual-spec Mounting Base (Vixen & Arca Swiss), 2.5" Dual-speed Rack and Pinion Focuser, CNC Carry Handle (with easy mount design for the optional guiding scope), clamshell type Mounting Rings for telescope, and the new innovative Bahtinov Mask cover. And this gem of a telescope is relatively small and easy to store or transport.

Introducing a first innovative feature in the industry: Now this ZenithStar 81 APO Telescope from William Optics comes standard with a dust cover that has a built-in, clear Bahtinov Mask for perfect focusing every time. Simply remove the flat front cover plate, leaving the dust cover cuff in place on the telescope. Point the telescope at a bright star, and focus carefully. When the bright central diffraction spike looks exactly centered between the other two spikes forming an "X", then your telescope is in exact focus for stars. Remove the dust cover cuff carefully from the objective end of the telescope, and you are ready to image.

Specifications:



Product Number: A-Z81
Telescope Type: Doublet Apochromatic Refractor
Objective Aperture: 81 mm
Focal Length: 559 mm
Focal Ratio: f/6.9
Focuser: 2.5" Dual-Speed R & P Focuser
Camera Format: Full Frame/APS-C Image Compatible
Tube Color: Available in Blue, Red, or Gold
Tube Length: 460 mm (Fully Retracted), 560 mm (Extended)
Tube Weight: 3.53 kg W/ Rings & Dovetail
T-Mount: Interchangable T-Mount Style for Compatibility
T-Rings:None, T-Rings are available as optional accessories


In the Box
  • ZenithStar 81 APO Doublet Refractor
  • Mounting Rings
  • CNC Carry Handle Bar
  • 2.5" Rack & Pinion Focuser
  • 210mm DualSide Dovetail
  • Bahtinov Mask and Cap
  • Carry Case

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