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O

f all the many and varied telescopes
available  for  use  by  the  amateur
astronomers, the mountings that sup-

port them fall into two types - the alt-azimuth
and the equatorial.  The 'Using your telescope'
section of this booklet that follows will tell you
more about these terms and the actual use of
your instrument, so we will concentrate on
the actual initial assembly and adjustments of
your telescope here.

The initial assembly of your telescope is best
undertaken in daylight with plenty of room to
lay out the components and to familiarise with
the accompanying images to see how the
assembled instrument should look.  

The three legs should be attached to the tripod
head one by one by the three bolts and wing
nuts provided.  They should not be overtight-
ened, but just made finger tight.  Pay part i c u l a r
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 tray to be attached.  Adjust
the height of each leg so that the tripod head
is initially kept low for maximum rigidity,

taking note that the thumb screws holding the
legs in place are securely tightened prior to
the next stage.

Next, attach the alt-azimuth/equatorial mount
(depending on your particular model: see the
ALT-AZ or EQ label with the accompanying
photographs) to the tripod head, followed by
the accessory tray between the tripod legs if
you haven't already done so.

If your telescope mount  is fitted with flexible
slow motion controls (e.g. AZ-3, EQ-1, EQ2
and EQ3-2) these may now be attached to the
two small chrome shafts on the mounting via
the thumb screws on the ends of the cables,
taking  care  to  locate  the  screw  in  the
machined 'notch' on each shaft.  

4

Telescopes & Mounts...

ALT-AZ

EQ-5

ALT-AZ

Содержание 9877

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 10: ...10...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 20: ...20...

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