This APO doublet captures sharp, high-contrast images free of false color.Īll of the William Optics imaging APOs I’ve used for astrophotography have produced exceptional images. This makes the Zenithstar 73 an excellent choice for those looking for a primary imaging telescope. The Ohara FPL-53 ED Glass is a top-of-the-line material found only in the best apochromatic refractors. The William Optics Flat 73 1:1 Field Flattener with a 2-inch light pollution filter inside William Optics Zenithstar 73 Core Specs:Īstrophotography Performance in Compact Package The flattener threads directly into the telescope focuser drawtube for a secure connection. This is a great location in the imaging train and can easily be swapped out for another filter type between imaging sequences. The camera was attached to the telescope using the Canon 48mm T-Ring, with the Flat73 field flattener in place.Ģ-inch (48mm) filters conveniently thread inside of the Flat73 field flattener. The images above were captured using a stock Canon EOS 5D Mark II, with an Optolong L-Pro broadband filter in front of the sensor. The Orion Nebula and the Pleiades Star Cluster using the William Optics Zenithstar 73 APO In the fall of 2018, I captured the Orion Nebula, and the Pleiades star cluster using the Zenithstar 73 and a full-frame DSLR. The field of view allows you to capture large targets in their entirety, or in new framing presentations. With a focal length of 430mm, you’ll be able to capture large deep sky objects such as emission nebula and open star clusters. My deep-sky astrophotography target for the night was the Cocoon Nebula in Cygnus. If you would like to see this telescope in action with a DSLR camera attached, have a look at the following video. The William Optics Zenithstar 73 with a Canon 60Da DSLR attached. The model featured in this review is the 2018 edition with gold accents, with the new integrated diffraction-spikes Bahtinov mask in the dust cap. The design of these refractors are also tweaked year over year, from the guide scope rings to the field rotator. The Flat73 1:1 field flattener is recommended for full-frame astrophotography cameras, and what I have used for the images on this page.Īs with many of the telescopes from William Optics, the Zenithstar 73 comes in a number of color combinations (red, blue, and gold) and accessory packages. William Optics offers 48m T-Ring mounts to attach your Canon or Nikon DSLR to the telescope. The large imaging circle means that your images will not show vignetting near the edges of the frame. This telescope is a full-frame apochromatic refractor, which means that it’s perfect for cameras such as my Canon EOS 5D Mark II, or the popular Canon 6D. The impressive images I’ve captured using the Zenithstar 73 speak for themselves, and I would highly recommend this apochromatic doublet to anyone looking to capture sharp, wide-field deep-sky objects. The overall low profile and quick set-up time mean reaching for it more often when the clouds suddenly clear up. The Z73 has proven to be one of the most useful telescopes for astrophotography I have ever owned. The Andromeda Galaxy – Canon EOS 60Da and William Optics Zenithstar 73 I have used the Z73 to capture a number of deep-sky objects in my backyard, and have found it to be a tremendously versatile and impressive instrument.Īnyone in the market for a premium wide-field imaging refractor in a compact package will be hard-pressed to find a contender that can top the Zenithstar 73. If you are looking for alternative options, be sure to see my list of 10 of the best astrophotography telescopes available, along with example images taken through each one. The example images shared on this page should give you a good idea of what you can expect in terms of astrophotography with this compact refractor. With an objective lens using high-quality FPL-53 ED glass, the Z73 APO is a superb deep-sky imaging performer. The William Optics Zenithstar 73 is an apochromatic doublet refractor telescope built for astrophotography.
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