The field flatness and color correction of the Sky-Watcher Esprit 100 ED is noticeable, even in a single exposure. While the cost of […]. This is evidence of the Esprit’s excellent lens cell design, the area where aspiring apos sometimes fall short. On subzero (°C) nights once the telescope cooled down (after 30 to 45 minutes), it exhibited none of the aberration oddities I’ve seen in some test telescopes, effects created by cold temperatures pinching optics. “The focuser provides a generous 101 millimeters of travel, more than enough to accommodate every eyepiece I tried, from a 31mm Nagler to an 8mm Ethos, two eyepieces with extreme focus travel demands.” Without further ado, read the review for yourself here. Description. Review: A New Travel Mount for Astrophotography. The suggested retail price of $4,000 for a 120mm (4.7-inch) telescope (optical-tube assembly only; you supply the mount) makes this a scope for the refractor devotee. “I compared its performance with high-end Officina Stellare and Astro-Physics 105mm and 130mm Apos employing similar premium glass. . This matched or surpassed the effectiveness of other telescope/field flattener combinations I\'ve used. Alan Dyer of SkyNews has recently published a review on our Sky-Watcher Esprit 120ED Super APO Triplet. The three-inch focuser is exceptional as well. Assuming delivery from stock, and not after months of waiting, as with some brands, Sky-Watcher’s Esprit refractors become very attractive options for anyone looking for the best. Sky-Watcher Esprit 120ED has performed beautifully compared with the other telescopes of its class, offering a competitive price for the utmost quality. Even at high magnification with a 3mm eyepiece, star images appeared just as sharp,aberration-free and, “it exhibited none of the aberration oddities I’ve seen in some test telescopes, effects created by cold temperatures pinching optics.”, “…the Esprit 120’s performance matches the best in the business at a competitive price…”, “Sky-Watcher’s Esprit refractors become very attractive options for anyone looking for the best.”. The field flattener has a back focus (distance from its rear element to the focal plane, where the sensor needs to sit) of 75 millimetres. . https://www.skywatcherusa.com/products/esprit-120mm-ed-triplet-apo-refractor A new entry at the high end is the Sky-Watcher Esprit 120ED Super Apo. Without it, star images recorded as progressively more elongated outside of a central 16mm-diameter image circle. “I’m pleased to report that the Esprit 120 really performed!”, Alan Dyer of SkyNews has recently published a review on our Sky-Watcher Esprit 120ED Super APO Triplet. Included with the telescope is an add-on field-flattener lens made specifically for the Esprit 120 and needed only for imaging. These are the BMWs and Lamborghinis of the telescope world, commanding prices of $1,000 to $1,500 per inch of aperture. We put the LighTrack II from Fornax Mounts through its paces. With the field flattener, even when using a DSLR camera with a full-frame (24mm × 36mm) sensor, star images were absolutely pinpoint corner to corner, free of any coma, astigmatism or lateral colour dispersion. This field is for validation purposes and should be left unchanged. Tightening its nylon tension screws eliminated any image or focus shift when the rear plate was unlocked and turned. In short, the Esprit provided first-class optical performance visually and photographically. achieved with the Sky-Watcher ESPRIT 120 Field flattener which is designed exclusively for this telescope. 2. The suggested retail price of $4,000 for a 120mm (4.7-inch) telescope (optical-tube assembly only; you supply the mount) makes this a scope for the refractor devotee. at a premium price. I compared its performance with high-end Officina Stellare and Astro-Physics 105mm and 130mm apos employing similar premium glass. The Esprit’s 840mm focal length and relatively fast focal ratio of f/7 make it ideal for deep-sky imaging. I’m pleased to report that the Esprit 120 really performed. At 22 Lbs. I was impressed. But the Esprit 120’s performance matches the best in the business at a competitive price, especially considering the included field flattener. Prestige alone won’t justify price, however; performance is all-important. The Esprit’s included 28mm eyepiece is best described as “serviceable,” good for public star parties but not for discerning observers. In the March/ April 2012 issue, he writes, “With the field flattener, even when using a DSLR camera with a full frame (24mm x 36mm) sensor, star images were absolutely pinpoint corner to corner, free of any coma, astigmatism or lateral color dispersion. The premium optical materials used in this telescope include an objective lens with FPL-53glass. The telescope has two hinged tube rings (similar in style to rings from suppliers such as Astro-Physics, Parallax and William Optics), drilled and tapped with multiple holes top and bottom, plus a hefty dovetail plate that is compatible with the Celestron CGEM or Losmandy mounting systems. Suggested by the SkyNews team, here’s a range of celestial gifts for the space aficionado in your life. A welcome feature is that the rear plate of the focuser can rotate for framing targets. Sky-Watcher - The worlds largest telescope manufacturer. The focuser provides a generous 101 millimetres of travel, more than enough to accommodate every eyepiece I tried, from a 31mm Nagler to an 8mm Ethos, two eyepieces with extreme focus travel demands. This matched or surpassed the effectiveness of other telescope/field-flattener combinations I’ve used. The fine motion of the focuser’s dual-speed action made it easy to nail precise focus.
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