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

William Optics Zenithstar 61 II APO

  (8 Reviews)
✓ 2 year warranty


Out of stock due 15-20 working days

About this product

Model:  wo_zs61_ii_gd
Part Number:  A-Z61IIGD

Latest 2020 model with Bahtinov Mask cap, CNC saddle handle, longer dovetail & Soft Case. 

The William Optics Zenithstar 61 II 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).  

The fast f/5.9 focal ratio and compact size make 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 Red, Gold or Space Grey 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.


  • 61mm diameter, 360mm focal length, f/5.9
  • Two element APO design using FPL-53 glass
  • 2" R&P Focuser for smooth, stable and reliable focusing
  • Integrated CAT Handle bar with Vixen-style Finder Shoe Clamp - great for guide scopes!
  • Integrated Bahtinov Mask for easy, precise focusing
  • CNC clamp ring with saddle handle bar and longer dovetail makes balancing and mounting much easier and more rigid
  • Soft padded case
  • Tube length: 245mm retracted / 315mm extended
  • Tube Weight: 2.2kg

Telescope Field of View Simulator

What's in the box

  • ZenithStar 61 OTA
  • 2" to 1.25" Adapter
  • OTA Mounting RIng
  • Cat Handle / Finderscope Clamp
  • Vixen-style Dovetail
  • Soft padded case


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
Mount Vixen-style Dovetail
Field Stops Baffles
Tube Length 245 mm Fully Retracted
315 mm Fully Extended
Tube Weight 2.2kg

Customer reviews

Average Rating (8 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Thursday, 17 June 2021  | 

Amazing quality, and an awesome scope. ,really all the reviews that have gone before me say it all .
William Optics you have done it again.

Rating (max 5):  
Nice little scope
Saturday, 5 June 2021  | 

This is a very useable quality scope. I only bought it to pass the time until my SCT order from February arrives. Itís my first owned scope so I canít compare to others but all the William Optics gear I bought is high quality stuff.

Rating (max 5):  
Seemingly indestructible, ultra portable telescope, with excellent image quality
Tuesday, 13 April 2021  | 

I bought this as a portable field scope and as a guide scope for my 8" EdgeHD, along with the 61ii flattener. The build quality is excellent. Within the first few weeks of purchasing this scope I managed to drop it 1 metre onto gravel after failing to secure it properly to the main OTA. This was quite traumatic to watch. Astonishingly the scope was 99.9% unscathed (just a minor scuff on the cap) - optics appear fine - in fact I have recently used this for wide field imaging and I'm extremely impressed with the results. Awesome product!

Rating (max 5):  
High Quality Telescope
Thursday, 8 April 2021  | 

This item was promptly delivered by First Light Optics and, straight out of the box, it is obvious that this is made to the highest of standards. It feels really solid and well constructed from high quality materials. William Optics have carefully considered the needs of photographers in the design, and the focussing system is a treat to use. I can not recommend this too highly and look forward to great results from it whenever clear skies permit.

Rating (max 5):  
William Optics Zenithstar 61 Apo
Monday, 22 March 2021  | 

I bought this little scope,as i intend to set up a dual imaging rig,and i wanted a scope that would,nt be adding too much more weight onto the mount.Being William optics i expected quality,and thats exactly what i got. the scope is a thing of beauty and very well made.A big must for me is that it has a rack and pinion focuser,as i did,nt want any slippage when at the Zenith.The two speed focuser is exerllent and holds its position very well indeed with weighty cameras.
Overall this little scope punches well above its weight both optically and mechanically,and i would heartedly recommend to anyone who is looking for a scope like this.

Rating (max 5):  
Quality scope
Friday, 12 February 2021  | 

Fantastic quality scope using with flattener really impressed and great service from FLO

Rating (max 5):  
A little gem
Wednesday, 20 January 2021  | 

I was absolutely delighted with the ZS61 when it arrived. Everything about it just oozes quality. The focus wheels feel lovely and smooth, and allow for both coarse and fine adjustment. The built in Bhatinov mask is a lovely touch. I have yet to point it at the stars (thanks clouds), but have given it a brief daylight test. Focussing way across the fields to some distant trees, in the grimmest of weather, it was able to pick out some very fine detail amongst the branches and twigs. I am very happy with the purchase, and am rapidly becoming a Williams Optics convert.

Rating (max 5):  
Thursday, 5 November 2020  | 

Super livraison comme d habitude...merci Flo et a bientŰt.


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