![]() ![]() ![]() eyepiece used with the barlow is retained. Another great benefit of this idea is that the longer eye relief of the longer f.l. Update March 2023: Weve found the Sky-Watcher Stargate-500P Synscan increasingly difficult to find. The other aberrations cancel in a similar way! This is one of the eyepiece designer's most powerful weapons, and it is used in most of the shorter focal length ultra-wide designs. The best telescopes for deep space will let you observe far-away galaxies, nebulas. The reason? Most of the aberrations caused by positive spherical lenses (Coma, Astigmatism, Curvature of Field and Spherical Aberration) can be reduced and sometimes almost eliminated by introducing a negative system (barlow) which has the same aberrations in negative quantities! Spherical aberration of the system is reduced as the positive spherical aberration of the eyepiece is cancelled by the negative spherical aberration of the barlow. ![]() Optically, for all other sues, the eyepice+barlow outperforms the eyepiece working alone. The only time the eyepiece alone may perform as well, is on-axis, in a high-contrast application, as the extra optics of the barlow may cause a slight depreciation. Download the detailed information on Polar Alignment for EQ1 and EQ2 mounts. For longer exposure times, the mount is usually adjusted using a very accurate star-movement measurement technique called "drift alignment." Download the detailed information on Polar Alignment. If you are trying astrophotography, a more accurate alignment is required, and you will need a polarscope if your mount is equipped for it. This alignment is good enough for visual observation. Now, with the mount approximately level, align the telescope parallel to the polar axis (ie set the Declination axis to 90 degrees), and then adjust the polar axis until the star Polaris (the "North star") appears in the centre of the field of your finderscope. The ideal telescope of choice for beginner to intermediate astronomers who are looking to expand their skygazing experiences. The brand is distributed in Canada and Europe and, in the late 2000s, was extended to the USA market. The angle of the polar axis should also be set equal to your Latitude. The products are manufactured at Synta Taiwan's Suzhou Synta Optical Technology Co., Ltd. With a truss tube design, the telescope is relatively lightweight. First, the finderscope should already have been aligned to the telescope by centring a distant fixed object in the telescope's field and then adjusting the finderscope with its adjusting screws until the object is at the centre of the crosshairs. Sky-Watcher's Stargate-500P is a 20-inch aperture colossus that offers serious deep-sky observers a top-tier viewing experience. For visual use, only a rudimentary alignment of the polar axis of your equatorial mount is required. ![]()
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