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Helios 9877, User Manual

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Astronomical 

Telescope

User Guide

OPTICAL VISION LIMITED

www.opticalvision.co.uk

®

WARNING!!

Never point the telescope directly at or near the Sun at any time.
Observing the Sun, even for a fraction of a second, will result in
instant and ir reversible eye damage. Please ensure minors ar

e

supervised by an adult conversant with this real danger when   

using telescopes or binoculars. 

Summary of Contents for 9877

Page 1: ...G Never point the telescope directly at or near the Sun at any time Observing the Sun even for a fraction of a second will result in instant and ir reversible eye damage Please ensure minors ar e supe...

Page 2: ...perceive lunar craters for example half the size of those visible in a 60mm instrument No amount of magnification applied to the smaller telescope will show you that which will be visible in the large...

Page 3: ...have optical windows sealing the end of the tube which would otherwise be open in a conventional Newtonian the internal optical components are far better protected from the elements and dust Remember...

Page 4: ...attention to the orientation of each leg prior to assembly such that the tripod tray bracket is facing inward The tripod may now be placed on the ground with the legs splayed enough for the accessory...

Page 5: ...e is now balanced about the polar right ascension axis ii With the counterweight bar horizontal ensure that the right ascension clamp is locked and unlock the declination clamp and turn the telescope...

Page 6: ...lamps Alt az mount Use the slow motion controls as necessary to centre the object in the field of view iv Turn the focuser knobs back or forth until the image becomes crisp and sharp Do not be concern...

Page 7: ...n diameter so our telescope eyepiece example would enable us to display the whole of the Moon s disc within the eyepiece s field of view How many eyepieces should you have Three is ideal one low one m...

Page 8: ...tude On more sophisticated mounts such as provided with the Capricorn 70 2 and the Evostar 90 3 there is provision for slow motion controls in both altitude and azimuth this makes for much finer contr...

Page 9: ...ky not surprisingly this is termed the Polar Axis As depicted in Fig 2 on page 11 the Equatorial is the mounting of choice if any form of astrophotography is envisaged It also makes the process of pro...

Page 10: ...10...

Page 11: ...r motorised applied to what we must now call the polar axis is all that is necessary to track a star through the sky In order for this action to follow a star without deviation the polar axis of the e...

Page 12: ...ier if a reticle is placed at the eyepiece focus and aligned to indicate this motion rather than having to remember it in the mind s eye The reticle can be a rolled piece of cardboard joined by sticky...

Page 13: ...use the sky s co ordinate system to find objects not visible to the eye or finder scope The setting circles The sky is plotted in a similar way to the Earth s longitude and latitude system except that...

Page 14: ...ope has been moved to a new object having an R A of 7 hours 30 minutes If the target is not visible delicate sweeping with a low power eyepiece should bring it into view Appendix Most good star atlase...

Page 15: ...he best eyepieces to use in the initial finding and centring of any object Once centered the object can be focused by turning one of the knobs of the focusing mechanism You will notice that the astron...

Page 16: ...ars that will use these very coordinate sys tems but for now you need not worry about them Star charts are of little use to the novice since many are confusingly covered with lines labels which freque...

Page 17: ...unter the bright star Procyon pronounced Pro sigh on in the constellation of Canis Minor the Lesser Dog A further hand span to the upper left brings you to the celestial twins of Gemini Castor and Pol...

Page 18: ...rses is not necessary in order to get very attractive pictures of the constellations all that you need is a 35mm camera with a manual or B setting setting a standard 50mm lens a fast colour or B W it...

Page 19: ...them to print all frames regardless If you can intersperse the pictures with everyday terrestrial scenes then so much the better since this makes it easier for them to note the edge of a frame nothing...

Page 20: ...20...

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