William Optics Zenithstar 61 APO

William Optics Zenithstar 61 APO
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£399.00
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Incoming - Shipped 10-15 working days.

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


Special Bundle Price - Save £10!

Buy a William Optics ZS61 APO Refractor and Dedicated Flattener together to save!

Simply add both items to your basket to automatically receive the discount.

INCLUDED IN THE BOX

  • 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.

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

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