Manufacturer: William Optics
Product number: A-Z73IIIRD

EUR 899,00RRP EUR 999,00you save 10% (EUR 100,00)


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William Optics ZenithStar 73 mm f/5.9 Apochromat - Red
The ZenithStar series from William Optics consists of compact, but very high quality apochromats, which are ideal for use with a DSLR camera. With them, very good wide-angle images of large star fields can be achieved. In combination with the optional flattener, this results in a corrected field of view of 45 millimeters in diameter.

The lightweight and compact ZenithStar Apo and a DSLR fit ideally on a photo mount, such as the Star Adventurer from Skywatcher or the SkyGuider Pro from iOptron - a lightweight and uncomplicated system for astrophotography.

The features:
This 73 mm ZenithStar doublet APO refractor from William Optics boasts Ohara FPL53 glass from Japan and a saddle handle bar that accepts Synta-style dovetails, such as the UniGuide guidescope or the Slide base guiding rings (not included). The ZenithStar 73 also comes with a 2.5" rack & pinion focuser and dual-sided dovetail bar. The William Optics DSD 210 plate has both a Vixen and Arca Swiss size at each end of the plate. The plate has two 1/4-20 threaded holes.

Ohara FPL53 vs FPL51 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 dispersion of a particular glass. Pure fluorite offers the lowest dispersion at around 94.99 V, Ohara FPL53 glass is very close to fluorite at 94.93 V and is often referred to as synthetic fluorite. FPL53 is also noticeably better than Ohara´s lower spec´ FPL51 glass which offers an abbe index of 81.54 V.

Astrophotographic results obtained with this telescope on Astrobin
Here you can find some astrophotographs made with this telescope model: Link to Astrobin
Lens Type:Doublet lens with FPL53 glass
Lens Diameter:73 mm
Focal Length:430 mm
Aperture:f/5.9
Limiting Magnitude:11.1 mag
Resolving Power:1.58 arcseconds
Camera Format:APS-C, Full Frame
Image Circle:> Full Frame
Focuser:2.5" dual-speed R&P focuser with 2" receptacle
Dovetail Bar:Vixen and Arca Swiss
Finder Shoe:Vixen type
Tube Material:Anodized aluminum
Tube Length:330 mm (fully retracted) / 420 mm (fully extended)
Tube Weight:2.83 kg (6.23 lbs)
William Optics ZenithStar 73 mm in red color with 2.5" Rack & Pinion Focuser
Mounting Rings
Handle Bar
Bahtinov Mask
Dust Cap
Dual Dovetail Plate
Reduction to 2"
Soft Case

Astrophotographic results obtained with this telescope on Astrobin
Here you can find some astrophotographs made with this telescope model: Link to Astrobin


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