This APO doublet captures sharp, high contrast images free of false color. 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. Z73 Doublet Air-Spaced APO with synthetic fluorite FPL-53 extra low dispersion glassĢ.5" Rack & Pinion focuser with 10:1 micro adjustmentĬNC Handle Bar with Vixen style quick release or guidescopeĢ" to 1.25" adapter with brass compression ringįREE WO patented Diffraction Spikes Bahtinov Mask CapįREE high quality soft carrying bag Astrophotography Performance in Compact Package This includes everything from a color-matched dovetail plate to the photo adapter for your DSLR camera. The price includes the telescope only, as you can add a number of extras to your order. The William Optics Zenithstar 73 currently retails for Rupees 66000.00. If you are new to deep sky astrophotography but have dabbled in tracked night sky shots including the Milky Way – this is likely the best possible next step for you. Deep Sky Imaging with the Zenithstar 73 APO When combined with a portable camera mount, you’ve got a very capable deep-sky imaging rig that can pack up into a backpack or travel container.Ī collapsible carbon fiber tripod, the iOptron SkyGuider Pro, and the Z61 is probably the most portable deep sky astrophotography setup you can have. Highly portable and LightweightĪ high-quality refractor at this size is the perfect travel scope. The ultra-wide 360mm focal length means collecting photons on HUGE areas of the night sky in a single frame.Įven with a crop sensor camera like the Canon T3i/600D, the focal length of 576mm is still more than wide enough for the big targets. If you have ever struggled with framing up a large target such as the North America Nebula or Andromeda Galaxy, the Z61 is a breath of fresh air. Image exposures of 2-3 minutes at ISO 1600 are likely all you will need to capture deep details of your target. Thanks to its fast optics (F/5.9), this refractor collects a lot of light in a short period of time. 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 abbe index is used to quantify the 'partial dispersion' of a particular glass. The dispersion properties of ED and SD glass elements are important in determining the overall colour correction. The scope is small and light enough with an overall weight of 2.8kg approx to work with nearly any medium-duty equatorial GoTo mounts with a recommended payload capacity of 5 kg. The Zenithstar 73 is small, CNC machine crafted and highly portable, an overall package / value for money for any budding / professional astrophotographer. The quick setup time of the telescope allows users to reach out to the telescope more often when the clouds suddenly clear up. One can even use the Zenithstar 73 for Solar System observation / photography as well as moon craters and also for day time terrestrial observation and photography. Its an ideal instrument for wide-angle deep sky imaging with a variety of DSLR Camera or dedicated professional astrophotography cameras. The example astrophotpgraphs shared on this webpage should give you an idea of what you can expect our of the Zenithstar 73 ED APO. When you join the William Optics Field Flattener (sold separately) to the Zenithstar 73mm telescope, it gives edge to edge results in deep sky imaging. The Ohara FPL-53 ED glass with an f/5.9 ratio negates all false colours and gives razor sharp images with high contrast images. The super high quality Ohara Fluorite (FPL-53) ED glass made with Taiwanese manufactring precision make the Zenithstar 73 an outstanding deep-sky imaging telescope. The William Optics Zenithstar 73 is an ED Apochromatic Doublet Refractor Telescope designed and built for professional astrophotography.
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