Dave Says: "I've had my own WO Megrez 72FD for 7 years and its still my most used APO, and this is its successor. With the same bomb-proof build quality and now brought up to date with a precision rack and pinion focuser making it ideal for portable astro-photography."
"The ZS71 is the perfect partner to Sky-watcher's Star Adventurer when used with a BoDai-Global CloverThree Counterweight for longer exposures up to 10 minutes with practice. At 2.7kgs it's perfect as your second 'scope or even as your main refractor and is great to use terrestrially!"
New Updated WO 61 APO 2018 Model featuring Patented Bahtinov Mask Cap
The air-spaced doublet lens combining fully multi-coated optics and an Ohara FPL-53 ED glass element give the New William Optics Zenithstar 61 APO sharp, high contrast images which are virtually free of false-colour.
Ideal for convenient wide field astrophotography or piggybacking with it's fast f/5.9 focal rato and compact size.
Plus when used for astrophotography or wildlife photography the New Zenithstar 61 APO is an extremely convenient ultra-portable telescope for visual astronomy and provides high resolution images.
Easy framing of target with convenient rotatable L mounting bracket.
CNC machined aluminium gives a superior fit and finish.
Dual speed 2" 1:10 R&P focuser.
Available in Gold, Blue or Red 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.
Designed for multiple purposes, this special scope will delight you from the first minute of use.
Optional Accessories: CloverThree Adventurer Red, Polarite (right angle finder), 1.25" 45 Deg. Erecting Prism, 1.25" DuraBright Dieclectric Diagonal, 0x8. Flattener/reducer and soft carry case are also available as optional accessories (see related products below), perfect for astrophotography use.
Please call Dave now on 023 9257 0283 for more info.
ZenithStar 61 APO Specifications:
Focal Ratio F/5.9
Focal Length 418 mm
Objective Type ED Doublet, Air Spaced
Fully Multi-Coated, SMC coating.
Resolving Power 1.58"
Limiting Magnitude 11
Lens Shade Retractable
Focuser 50.8mm(2") Rack & Pinion Focuser
with 1:10 Dual Speed microfocuser
80 mm (3.2")Focuser Travel Length
360° Rotatable Design
1.25" Adapter Brass Compression Rings from 2" (optional 2" push fit DSLR adapter)
L-type Mount Integrated L Bracket (fits SmartEQ mount)
Field Stops Baffles
Tube Diameter 93 mm (3.66")
Tube Length 310 mm Fully Retracted, 355 mm Fully Extended
Draw Tube Travel 80mm with graduation scale
Tube Weight 6 lbs. (2.7 kg)
It's like the Swiss Army Knife of small telescopes
There are lots of options for the ZS71 making it a great choice as your first all-round telescope. Fully baffled, for very low Chromatic Aberration (works fine on a Full Moon), and for a sharpness you don't get on cheaper refractors. You can use it for guiding, light enough for piggybacking and for use with lighter EQ and Alt-Az mounts for astro-imaging with DSLR or CCD.
Use it as a manual telephoto lens for great wildlife shots (we've tested it), and for visual birding and nautical use with their bright right-erecting prism.
The Red Dot finder is a must-have add-on whatever you do.
Add the 0.8x Flattener 6 for half the exposure time with a fast f4.72 for amazingly detailed shots of M31 Andromeda and other deep sky objects with a truly flat field. For planetary work, you could use this with a QHY5-II 5P Colour camera and a Barlow for great images of the Moon and planets.
Visual astronomers are not forgotten either, with William Optics high quality range of SWA, UWA and XWA eyepieces, especially the 110º 5mm XWA eyepiece allied to either of their Carbon Fibre clad Dura Bright 99% Diagonals.
Specification for Apochromatic Lenses
All WO refractors objective are double tested and inspected before shipping, these telescopes are free of coma and astigmatism.
Since all individual lens surfaces are machine coated sometimes it could have visual imperfections which do not affect the objective optical performance.
All William Optics Refractors carry a 2 year Warranty.