Manuale d’uso / di manutenzione del prodotto 9877 del fabbricante Orion
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Astronomical T elescope User Guide OPTICAL VISION LIMITED www.opticalvision.co.uk ® W ARNING!! 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 r eversible eye damage.
O f all the many and varied telescopes av ai lab le for use b y am at eur astronomers and nature watchers, all can be cat egor ised into three typ es: th e r e f r a c t o r , the r e flec t or & the c a t a dioptr ic .
Consequently, an objective lens is a piece of optical equipment that is difficult to manufac - ture and explains why refractors are the most expensive form of telescope, aperture for aperture.
O f all the many and varied telescopes a vailable for u se by the a mateur astronomers, the mountings that sup- port them fall into two types - the alt-azimuth and the equa torial.
Balancing the Telescope: T o eliminate stresses on the EQ equatorial mounts and to ensure smooth, judder-free motion of the tel escope th e inst r ument needs to be balanced about both the declination and polar (right ascension) axis. This is especially im- portant if you propose to use a motor drive for astrophotography at a future date.
Attaching the finderscope: An essential prerequisite for the easy location of objects on both land and in the sky is the corr ect location and al ignment of the finder- scop e that attac hes to the tube of the tele- scope.
The focal length of the telescope is usually given on a label near the eyepiece focuser and is the distance from the main lens or mir ror to the point at which it forms an image of a distant object.
D e pendi ng on the type of te lescope mount that you possess, there are two ways in which you can move the instr u- ment in order to locate and track objects in the sky.
The further that one moves across the sky from Polaris, the apparent motion of the stars becomes more evident and their Altitudes and Azimuths will be continually changing. Taking the star labelled ‘AA’ in Fig. 1, at the instant of the observation its Altitude was 60° and its Azimuth bearing was also 60°.
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T he E art h's ea stw ard r otati on c auses stars to apparently rotate around a point in the sky which is a projection of the Earth's axis, called the celestial pole.
12 Polar axis alignment (precise setting) The follow ing process w ill allow tracking without the need for occasional cor rections, an d i s e ss ent ial i f p hoto gra phy us in g a motorised drive is envisioned.
13 Once this line of axial movement has been established, set the star at the edge of the field and allow it to drift across via its own motion. If the star drifts upwards from this line ( figure 5a ), then the north end of the polar axis needs to be raised.
14 Using the setting circles (The following applies to telescopes using a single index on the R.A. circle) The easiest way to use setting circles is to off- set from a known position. Set the telescope on an object whose position is known (i.e. a bright star in a recognisable constellation - such as listed in the appendix).
15 W i th t he t el e sco pe as se mb le d, ba la nc ed a n d po l ar -a l i gn e d a s d e s cr i b ed pr e v i o u s l y , yo u a re re ady t o be g in o bs er v a t i o n s .
16 S ince the dawn of mankind there have bee n indepe ndent thinkers who hav e sought to understand the nature of the Universe and our relationship to it.
17 to cover the seven principal stars that delin- eate the figure of Orion. If we wish to be a little bolder we can relate the span of our outstretched hand to actual angular measure. It so happens that the span of our hand cor r esponds to just over 20 degrees (the symbol for degree is°), while the length of our thumb is about 7°.
18 s peci a l fil ters th at can almost magica lly r emove the orange cast to the sky created by sodium streetlights revealing a dark, star - studded sky beyond.
19 a simple way to avoid camera shake which ruins many a time exposure. So how long should you leave the lens uncov- ered? Under dark skies with ISO 400 film and a 50mm f/2.8 lens you can expose for up to about 20 seconds before the motion of the stars becomes evident as small trails on the film.
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Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Orion 9877 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Orion 9877 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Orion 9877 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Orion 9877 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Orion 9877, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Orion 9877.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Orion 9877. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Orion 9877 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
