William Optics Zenithstar 126 APO 2020
Colour: GoldColour: RedColour: Blue

William Optics Zenithstar 126 APO 2020

£2,095.00✓ 2 year warranty


Out of stock due 15-20 working days

About this product

Model:  wo_zs126_gd
Part Number:  A-Z126IIGD-RP33

NEW 2020 model with 3.3 inch R & P Focuser & Saddle Handle Bar.

The NEW William Optics Zenithstar 126 APO features an air-spaced doublet lens with an Ohara FPL-53 ED glass element in a CNC machined ultra high precision lens cell with fully multi-coated optics for high resolution, high contrast images virtually free of false-colour. 

Despite it's large 126mm objective diameter it is surprisingly compact and very solid! Many airlines will accept it as carry-on luggage. An ideal size for serious observations of deep sky objects and planets.

Versatile f/7.7 native focal ratio or f/6.2 when used with 0.8x flattener / reducer (available separately).

Supplied with mounting rings, Losmandy style dovetail bar, Saddle Handle Bar and Bahtinov mask cover.

CNC machined aluminium for a superior fit and finish. 

Heavy duty, 1:10 dual speed, 3.3" rotatable V-Power Rack and Pinion focuser.

Available in Blue, Red or Gold anodised.  

Ohara FPL-53 vs FPL-51 ED Glass

The dispersion properties of ED and SD glass elements are important in determining the overall colour correction. The abbe index is used to quantify the 'partial dispersion' of a particular glass. Pure Fluorite offers the highest partial dispersion at around 94.99 V, Ohara FPL-53 glass is very close to Fluorite at 94.93 V and is often referred to as Synthetic Fluorite.  FPL-53 is also noticeably better than Ohara's lower spec' FPL-51 glass which offers an abbe index of 81.54 V.


  • 126mm f/7.7 Doublet air-spaced APO
  • CNC machined ultra-high precision lens cell
  • FPL-53 ED glass element for enhanced colour correction
  • 3.3 inch Heavy Duty, dual-speed Rack & Pinion focuser
  • 0.8x Reducer / Flattener available separately
  • Innovative Bahtinov mask cover included!
  • Supplied with mounting rings, Losmandy style dovetail bar, Saddle Handle Bar and Bahtinov mask cover.
  • Includes Soft Carry Case

Field of View Simulator

What's in the box

  • Telescope OTA
  • Mounting Rings
  • CNC made Saddle Handle Bar
  • Losmandy-Style Dovetail
  • Bahtinov Mask Cover
  • Soft Carry Case


Aperture 126 mm
Focal Ratio F/7.7
Focal Length 970 mm
Image Circle Z126 with Flat 6A II 43mm
Objective Type ED Doublet, Air Spaced,
Fully Multi-Coated, SMC coating.
Lens Shade Retractable
Tube Weight 9.94 kg - Including dovetail & rings
Tube length 667mm Retracted, 856mm Extended

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