Ascension 80ED Owner's Manual

Triplet refractor telescope

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Summary of Contents for Ascension 80ED

Page 3: Please Read This First
HANDLING YOUR TELESCOPE. TELESCOPES CAN BE LARGE AND HEAVY AND CAN CAUSE DAMAGE IF NOT HANDLED CORRECTLY. ALWAYS SEEK ASSISTANCE IF IN DOUBT. MOST YOUR EQUIPMENT TAKE THE TIME TO READ THROUGH THIS MANUAL. © Opticstar Ltd / Ascension 2007-2014...
Page 5 Introduction Congratulations on the purchase of this premium Ascension apochromatic refractor telescope. Your new Ascension refractor is very well suited for both astronomical and terrestrial observation. Its Japanese FCD1 triplet objective lens, solid construction and medium focal ratio make it also ideal for deep sky imaging.
Page 6: Mounting The Telescope
18Kg for the 102mm and 20Kg for the 127mm tube. A complete imaging system would consist of a main imaging telescope, guide telescope, cameras and platforms. © Opticstar Ltd / Ascension 2007-2014...
Page 7 Using the Finder-scope If your telescope includes an Ascension 8x50 finder scope please read this section to understand how to get the most out of it. The Ascension finder scope is a high example showing a desirable right way-up image when you look through it.
Page 8 Look through the finder-scope and adjust the finder-scope--focusing-ring so that you can obtain a sharp view, finally tighten the finder-scope-locking-ring against the finder-scope-focusing-ring. Finder-scope Illuminator The Ascension finder-scope uses a red LED variable illuminator to light up the crosshair. You can adjust the brightness of the built-in brightness...
Page 9 The finder-scope is now aligned to the main telescope. You can check and refine alignment on a night sky object like a star if required. If you do not use a diagonal you may need an extension tube to reach focus. © Opticstar Ltd / Ascension 2007-2014...
Page 10 Moon, high magnifications will show a wealth of detail. You will see mountain ranges, craters and evidence of volcanic activity when the Moon was mainly composed of molten rock. You will need a neutral density filter to © Opticstar Ltd / Ascension 2007-2014...
Page 11 Good deep sky objects to look for with a small telescope include the Orion Nebula, the Trifid nebula, the Ring nebula, the Andromeda Galaxy and a number of star-clusters among various other objects. © Opticstar Ltd / Ascension 2007-2014...
Page 12: Observing The Sun
When conditions are not favourable the maximum useful magnification for most scopes will be around 25-35 times per inch of aperture. Otherwise high quality apochromatic refractors like the Ascension ED triplets will offer the highest magnifications per inch of aperture under favourable conditions to a maximum of around x100 per inch.
Page 13 Ascension triplet ED refractors are ideal instruments for wide field deep-sky imaging due to their high quality apochromatic ED Japanese triplets, solid structure and Precision Focusers. They are very well suited for deep sky imaging when coupled with a camera like the Opticstar DS336 XL TEC- ©...
Page 14 80mm Ascension refractor to DS-336 XL produce unusually high definition images. The 80mm Ascension refractor can also be used as a guide scope for auto- guiding motorised/GOTO telescope mounts in conjunction with an appropriate guide camera and auto-guide controller. Complete auto-guide kits include the Opticstar AG-130M CA, AG-131M CA and AG-131C CA.
Page 16: Appendix A: Magnification & Field Of View
Magnification = telescope’s focal length / eyepiece’s focal length = F/f For example a telescope with a focal length of 480mm and an eyepiece with a focal length of 5mm will magnify its target 100 times (480/5=96). © Opticstar Ltd / Ascension 2007-2014...
Page 17: Field Of View
The focal ratio represents the speed of the telescope’s optics; the focal ratio can be calculated by dividing the focal length by the telescope’s aperture. Telescopes with faster/shorter focal ratios like the Ascension 80mm F6 ED triplet benefit from wider fields of view, and a subsequent increase in brightness and image resolution.
Page 18: Appendix B: Optics
Place the telescope on a table and not on the floor where most of the dust can be found. Never try to remove condensation using a cleaning cloth or similar, this will most likely smear the optics. © Opticstar Ltd / Ascension 2007-2014...
Page 19: Appendix C: The Focuser
APPENDIX C: The Focuser Focuser Adjustment The Ascension comes with a 1:10 dual-speed focuser that has been adjusted at the factory. In certain cases it may be necessary to regulate the tension to improve performance by adjusting the two silver thumb-screws below the focuser.
Page 20 Note that if you over tighten the screw pairs the drawtube will ‘stick’, if the screws are too loose the drawtube will not hold in place. © Opticstar Ltd / Ascension 2007-2014...
Page 21: Appendix D: Imaging
GPUSB ST-4 auto- between a rather basic image and guide controller one of quality. © Opticstar Ltd / Ascension 2007-2014...
Page 22: Appendix E: Specification
99% reflectivity Eyepieces, 70 10mm & 20mm 10mm & 20mm 10mm & 20mm Case aluminium aluminium aluminium ASCENSION TELESCOPES COME WITH BACK TO BASE 12 MONTHS WARRANTEE © Opticstar Ltd 2007-2011, ALL RIGHTS RESERVED © Opticstar Ltd / Ascension 2007-2014...
Page 24 Opticstar Ltd 87 Washway Road, Sale Greater Manchester M33 7TQ United Kingdom WEB: www.opticstar.com - EMAIL: info@opticstar.com © Opticstar Ltd / Ascension 2007-2014...