Summary of Contents for ASTRONZ DOBSONIAN GS680
- Page 1 OWNER’S MANUAL DOBSONIAN TELESCOPE ASTRONZ GS680 200mm ( 8”) F/6 ASTRONZ GS880 254mm (10”) F/5 ASTRONZ GS980 303mm (12”) F/5...
- Page 2 Astronz (Astronomy NZ Ltd) is fully owned by the Auckland Astronomical Society and operated by its members. Our mission is to supply quality telescopes and accessories at a reasonable price. By importing and selling direct from the manufacturer to the customer we can keep our prices down and give you the best value on the New Zealand market.
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Page 3: Table Of Contents
Contents Introduction Specification Parts Assembly Using your Telescope Focuser Eyepieces Finderscope Observation Tips Selecting a SIte Cooling Seeing Storage Maintainence... -
Page 4: Introduction
Introduction Thank you for purchasing an Astronz Dobsonian telescope. This precision optical instrument is built with the highest quality materials and with proper care will provide many years of reliable service. The Dobsonian telescope is an “alt-azimuth” (up-down/ left-right) mounted Newtonian reflector type telescope. -
Page 5: Specification
Specifications GS680 GS880 GS980 Focal Length: 1200mm Focal Length: 1250mm Focal Length: 1500mm Focal Ratio: Focal Ratio: Focal Ratio: Aperture: Aperture: Aperture: 200mm 254mm 303mm Weight: Telescope 13kg Weight: Telescope 18kg Weight: Telescope 22kg Base 10kg Base 12kg Base 14kg Length: Telescope 1.25m Length:... -
Page 6: Parts
Base Assembly Unbox all parts for the base assembly and identify all the parts below: Base Sides (2) Handle (and screws) Base Front Feet (and screws) (3) Upper Base Plates Long Screws (10) Lower Base Plate Eyepiece Tray (and screws) Bearing Plates (3) Adjustment Bolt (wih large and small washers, ball bearing and bushing) -
Page 7: Assembly
Step 1: Screw the handle (F) to the Base Front (B) using the provided screws into the pre- drilled holes. Step 2: Screw the two Base Sides (A) to the Base Front (B) using the Long Screws (H) Ensure the sides are firmly at- tached, but do not overtighten. - Page 8 Telescope Assembly Locate the two Altitude bearings and install onto the sides of the optical tube using the screws already fitted in the slots on each side of the optical tube and hex wrench provided. The graduated scale allows you to make adjustments to balance the optical tube (particuarly if you use any heavy accessories).
- Page 9 Finderscope Assembly Locate the finder scope and the rubber O-ring, position the O-ring in the groove on the finder scope body. Loosen the thumbscrew on the “dovetail” finder scope base on the optical tube, and install the find- erscope bracket, tighten- ing the screw to hold it in place.
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Page 10: Using Your Telescope
Focal length of telescope Focal length of eyepiece So for an Astronz 200mm Dobsonian: 1200mm/9mm = 133 and 1200mm/30mm = 40 The basic rule of thumb to remember is that an eyepiece with a larger number has a lower power and will show a greater area of sky. -
Page 11: Finderscope
Finderscope Alignment In order to use the finder scope to locate objects, it first needs to be aligned so that objects in the “crosshairs” of the finder are visible through the eyepiece of the main telescope. This process is easiest during the day (though take care not to point either the finder or the main scope anywhere near the sun) by pointing the main telescope toward a distant object (such as a tree, mast or power pylon). -
Page 12: Selecting A Site
Observing Selecting a site The ideal site for observing with your Astronz Dobsonian telescope, is a dark outdoor site far away from city lights or other sources of “light pollution”. Whilst this may be impractical for most people, try to choose a location where there is as little light as possiblle (such as street lighting, security lighting, lights from windows etc). -
Page 13: Storage
Cleaning and Maintenance As your Astronz Dobsonian Telescope is a precision scientific instrument, great care should be taken in order to maintain the optics and alignment. Cleaning of any part of the telescope should be undertaken a little as possible.
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