William Optics Zenithstar 61 APO

William Optics Zenithstar 61 APO
William Optics Zenithstar 61 APOWilliam Optics Zenithstar 61 APOWilliam Optics Zenithstar 61 APO
William Optics Zenithstar 61 APOWilliam Optics Zenithstar 61 APOWilliam Optics Zenithstar 61 APO


In stock - Shipped 1-2 working days.

Model:  wo_zs61_gd
Part Number:  A-Z61GD
Brand:  William Optics

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  • ZenithStar 61 OTA
  • 2" to 1.25" Adapter
  • Rotatable L Bracket

The NEW William Optics Zenithstar 61 APO features an air-spaced doublet lens with fully multi-coated optics and an Ohara FPL-53 ED glass element for sharp, high contrast images virtually free of false-colour. 

Provides high resolution images when used for astrophotography or wildlife photography and is a convenient ultra-portable telescope for visual astronomy (think binocular astronomy targets).  

It's fast f/5.9 focal ratio and compact size makes it ideal for convenient wide field astrophotography or piggybacking. 

Convenient rotatable L mounting bracket for easy framing of target. 

CNC machined aluminium for a superior fit and finish. 

Dual speed 2" 1:10 R&P 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.

Product Specifications

Aperture 61mm
Focal Ratio F/5.9
Focal Length 360 mm
Objective Type Air-spaced doublet with fully SMC multicoated optics and Ohara FPL 53 ED element. 
Image Circle Z61 Φ 41mm / Z61 with Flat 61 Φ 43mm
Limiting Magnitude 10
Lens Shade Retractable
Focuser 50.8mm (2") R&P Focuser with 1:10 Dual Speed micro-focuser, 75 mm Focuser Travel Length
1.25" Adapter Compression Rings
L-type Mount Rotatable L Bracket
Field Stops Baffles
Tube Length 230 mm Fully Retracted
300 mm Fully Extended
Tube Weight 1.45kg

William Optics Zenithstar 61 APO Questions & Answers

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Average Rating (2 Reviews):  
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Rating (max 5):  
Ultimate backpack scope?
Tuesday, 24 October 2017  | 

Beautifully made, excellent optics if a bit small, good focuser. OTA + 2" diagonal+ 30mm LV eyepiece still weighs less than 2.5 kg. Best match I've seen for the Star Adventurer mount. A better AP scope than visual (with the flattener)

Rating (max 5):  
Professional telescope
Monday, 2 October 2017  | 

Lovely light and small telescope. If you want to travel light and explore the universe this is the best scope money can buy.

For imaging make sure you purchase a the field flattener and if using a dslr the correct t-adaptor size is m48

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December 2017 / View Older
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