![]() ![]() ![]() As William Optics changes the features and specifications of their product lines, we will update this guide to keep it accurate and useful for the foreseeable future. This buyer's guide summarizes the main characteristics of each current product line and serves as a single stop for information for prospective buyers of William Optics telescopes who wish to quickly understand how to choose a William Optics refractor for astronomical and terrestrial observation. William Optics frequently introduces innovations and features into their telescopes, and they occasionally release entirely new product families. ![]() You are covered by the eBay Money Back Guarantee - eBay Money Back Guarantee. William Optics refractors feature metal tubes and trim, ED (extra-low dispersion) glass in the objectives, and premium focusers for holding cameras and astrophotography accessories. William Optics Zenithstar 71mm Bahtinov Focus Mask. Founded by William Yang in 1996, the company concentrates on making high-quality and affordable refracting telescopes with a distinctive design and a robust build. William Optics is a Taiwan-based manufacturer of telescopes and astronomical accessories. Color Correction & Minus Violet Filtersįigure 1 – A William Optics Gran Turismo (GT) 102mm refractor.Correctors, Focal Reducers & Flatteners.FPL-53 is also noticeably better than Ohara's lower spec' FPL-51 glass which offers an abbe index of 81.54 V. 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. The new William Optics GuideStar 61 APO features the same high quality FPL53 ED doublet lens as the Zenithstar 61 so delivers sharp, high contrast images virtually free of false. The abbe index is used to quantify the 'partial dispersion' of a particular glass. Use as a portable high quality imaging scope or an ultra-high quality guidescope. The dispersion properties of ED and SD glass elements are important in determining the overall colour correction. (6D unmodified+William optics Z61+flattener+unguided tracking) Zenithstar61 has 380 mm focal length and f5.9. The fast f/5.9 focal ratio and compact size make it ideal for convenient wide field astrophotography or piggybacking.Ĭonvenient rotatable L mounting bracket for easy framing of target.ĬNC machined aluminium for a superior fit and finish.Īvailable in Red, Gold or Space Grey anodised. 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 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. Part Number: A-Z61IIGD Latest 2020 model with Bahtinov Mask cap, CNC saddle handle, longer dovetail & Soft Case. ![]()
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