William Optics

William Optics Zenithstar 61 II APO Gold

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Product Overview

William Optics Zenithstar 61 is a greatly versatile and portable refractor telescope for beginners and veterans alike. Designed for both astrophotography and wildlife photography, high power visual observing through the Zenithstar 61 Mark II is also hugely satisfying. The image is crisp, sharp and colour aberration free thanks to the use of top quality glass — FPL53, closely matching the legendary fluorite material. The 43mm image circle when Flat61 is used covers full frame size sensor nicely. The Zenithstar 61 Mark II is tiny in size yet it comes standard with 2" focuser with 10:1 micro adjustment, a rarity for a telescope this small!

William Optics Zenithstar 61 Package Includes:

  • Z61 Doublet Air-Spaced APO with synthetic fluorite FPL-53 extra low dispersion glass
  • 2" Rack & Pinion focuser with 10:1 micro adjustment
  • Rotatable Handle with Guide scope mount, and dovetail
  • 2" to 1.25" adapter with brass compression ring
  • Retractable lens shade with Bahtinov mask

Z61 MARK II Design Highlights:

  • 61mm f/5.9 doublet air-spaced objectives APO
  • Use of synthetic fluorite FPL-53 glass material
  • Very sharp image with excellent colour correction
  • Precision optics with fully multi-coated lenses using super-high transmission (STM) coating on all surfaces
  • Designed for astrophotography, wildlife photography & visual observation
  • Built in Focus Mask
  • Soft carry case


More Information
Focal RatioF/5.9
Focal Length360 mm
Objective TypeSynthetic Flourite FPL 53 Doublet, Air Spaced, APO 
Fully Multi-Coated, SMC coating.
Image CircleZ61 F 41mm / z61 with Flat 61 F 43mm
Limiting Magnitude10
Lens ShadeRetractable
Focuser50.8mm(2") R&P Focuser
with 1:10 Dual Speed micro focuser
75 mm Focuser Travel Length
1.25" AdapterCompression Rings
L-type MountRotatable L Bracket
Field StopsBaffles
Tube Length230 mm Fully Retracted
300 mm Fully Extended
Tube Weight1.45kg

Specification for Apochromatic Lenses

All WO refractors objective are double tested and inspected before shipping to our customer, these telescopes are free of coma and astigmatism.

Zenithstar 61 Manual Download
9 Pages (2.4 MB)
Optical Performance


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