About this product
Part Number: A-Z61GD
Updated 2018 Model featuring Patented Bahtinov Mask Cap
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.
What's in the box
- ZenithStar 61 OTA
- 2" to 1.25" Adapter
- Rotatable L Bracket
|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 |
|Average Rating (3 Reviews): |
Monday, 30 July 2018 | Adrian
William Optics Zenithstar 61 APO is a compact, sharp and quality wide field scope. It's very well made, and I've had no issues so far with it. I've used it for terrestrial viewing/images and for some Astrophotography. I took some Moon shots, and when the clouds cleared for an hour I even got quality Andromeda Galaxy images. The included bahtinov mask is another plus, within a minute my stars where pin sharp. Awesome scope, well recommend.
Tuesday, 24 October 2017 | Richard
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)
Monday, 2 October 2017 | Jaspal
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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